31021230012 has 24 divisors (see below), whose sum is σ = 76640686416. Its totient is φ = 9732150528.

The previous prime is 31021229999. The next prime is 31021230041. The reversal of 31021230012 is 21003212013.

It is a super-2 number, since 2×31021230012² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31021229973 and 31021230000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76032223 + ... + 76032630.

It is an arithmetic number, because the mean of its divisors is an integer number (3193361934).

Almost surely, 2^31021230012 is an apocalyptic number.

It is an amenable number.

31021230012 is an abundant number, since it is smaller than the sum of its proper divisors (45619456404).

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

31021230012 is a wasteful number, since it uses less digits than its factorization.

31021230012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152064877 (or 152064875 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 31021230012 its reverse (21003212013), we get a palindrome (52024442025).

The spelling of 31021230012 in words is "thirty-one billion, twenty-one million, two hundred thirty thousand, twelve".