| Base | Representation |
|---|---|
| bin | 111111100001001… |
| … | …0110000101111100 |
| 3 | 12111112110100001200 |
| 4 | 1333002112011330 |
| 5 | 13331104234322 |
| 6 | 551253335500 |
| 7 | 103546634316 |
| oct | 17702260574 |
| 9 | 5445410050 |
| 10 | 2131321212 |
| 11 | 9a4091199 |
| 12 | 4b5937590 |
| 13 | 27c736317 |
| 14 | 1630c07b6 |
| 15 | c71a28ac |
| hex | 7f09617c |
2131321212 has 144 divisors (see below), whose sum is σ = 5958493632. Its totient is φ = 639498240.
The previous prime is 2131321211. The next prime is 2131321223. The reversal of 2131321212 is 2121231312.
2131321212 is a `hidden beast` number, since 2 + 131 + 321 + 212 = 666.
It is a super-2 number, since 2×21313212122 = 9085060217442297888, which contains 22 as substring.
It is a Harshad number since it is a multiple of its sum of digits (18).
It is a nude number because it is divisible by every one of its digits.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (2131321211) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (17) of ones.
It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1380513 + ... + 1382055.
It is an arithmetic number, because the mean of its divisors is an integer number (41378428).
Almost surely, 22131321212 is an apocalyptic number.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 2131321212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2979246816).
2131321212 is an abundant number, since it is smaller than the sum of its proper divisors (3827172420).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
2131321212 is a wasteful number, since it uses less digits than its factorization.
2131321212 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 1668 (or 1663 counting only the distinct ones).
The product of its digits is 144, while the sum is 18.
The square root of 2131321212 is about 46166.2345443074. The cubic root of 2131321212 is about 1286.9143267918.
Adding to 2131321212 its reverse (2121231312), we get a palindrome (4252552524).
The spelling of 2131321212 in words is "two billion, one hundred thirty-one million, three hundred twenty-one thousand, two hundred twelve".
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