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21012003320 = 23571124314423
BaseRepresentation
bin10011100100011010…
…011011100111111000
32000020100210100211012
4103210122123213320
5321013033101240
613353000053052
71342461036620
oct234432334770
960210710735
1021012003320
118a02801100
1240a4a64188
131c9b258479
141034879880
1582ea1db65
hex4e469b9f8

21012003320 has 192 divisors, whose sum is σ = 60774658560. Its totient is φ = 6396445440.

The previous prime is 21012003283. The next prime is 21012003323. The reversal of 21012003320 is 2330021012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 21012003295 and 21012003304.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012003323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1449629 + ... + 1464051.

It is an arithmetic number, because the mean of its divisors is an integer number (316534680).

Almost surely, 221012003320 is an apocalyptic number.

21012003320 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 21012003320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30387329280).

21012003320 is an abundant number, since it is smaller than the sum of its proper divisors (39762655240).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21012003320 is a wasteful number, since it uses less digits than its factorization.

21012003320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14506 (or 14491 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

Adding to 21012003320 its reverse (2330021012), we get a palindrome (23342024332).

The spelling of 21012003320 in words is "twenty-one billion, twelve million, three thousand, three hundred twenty".