31001011212 has 24 divisors (see below), whose sum is σ = 73561723200. Its totient is φ = 10158523216.

The previous prime is 31001011163. The next prime is 31001011243. The reversal of 31001011212 is 21211010013.

It is a super-2 number, since 2×31001011212² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 21892662 + ... + 21894077.

It is an arithmetic number, because the mean of its divisors is an integer number (3065071800).

Almost surely, 2^31001011212 is an apocalyptic number.

It is an amenable number.

31001011212 is an abundant number, since it is smaller than the sum of its proper divisors (42560711988).

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

31001011212 is a wasteful number, since it uses less digits than its factorization.

31001011212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43786805 (or 43786803 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 12.

Adding to 31001011212 its reverse (21211010013), we get a palindrome (52212021225).

The spelling of 31001011212 in words is "thirty-one billion, one million, eleven thousand, two hundred twelve".