| Base | Representation |
|---|---|
| bin | 1001100011100001111011… |
| … | …11111001111010100000000 |
| 3 | 2202101201200210122012022222 |
| 4 | 10301300331333033110000 |
| 5 | 10223230104110000000 |
| 6 | 112404442210550212 |
| 7 | 4266032305053461 |
| oct | 461607577172400 |
| 9 | 82351623565288 |
| 10 | 21012020000000 |
| 11 | 6771169564927 |
| 12 | 243432ab98368 |
| 13 | b9556a8c74c3 |
| 14 | 528db6c0ad68 |
| 15 | 2668869bda85 |
| hex | 131c3dfcf500 |
21012020000000 has 288 divisors, whose sum is σ = 52703327188512. Its totient is φ = 8360576000000.
The previous prime is 21012019999909. The next prime is 21012020000009. The reversal of 21012020000000 is 2021012.
It can be written as a sum of positive squares in 16 ways, for example, as 20160962089216 + 851057910784 = 4490096^2 + 922528^2 .
It is a Harshad number since it is a multiple of its sum of digits (8).
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (21012020000009) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (23) of ones.
It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3939997334 + ... + 3940002666.
It is an arithmetic number, because the mean of its divisors is an integer number (182997663849).
Almost surely, 221012020000000 is an apocalyptic number.
21012020000000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 21012020000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26351663594256).
21012020000000 is an abundant number, since it is smaller than the sum of its proper divisors (31691307188512).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
21012020000000 is an frugal number, since it uses more digits than its factorization.
21012020000000 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 5581 (or 5537 counting only the distinct ones).
The product of its (nonzero) digits is 8, while the sum is 8.
Adding to 21012020000000 its reverse (2021012), we get a palindrome (21012022021012).
The spelling of 21012020000000 in words is "twenty-one trillion, twelve billion, twenty million", and thus it is an aban number and an uban number.
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