31213233012 has 48 divisors (see below), whose sum is σ = 78445644480. Its totient is φ = 9602554368.

The previous prime is 31213232969. The next prime is 31213233019. The reversal of 31213233012 is 21033231213.

It is a super-2 number, since 2×31213233012² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31213233012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31213233019) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1354039 + ... + 1376897.

It is an arithmetic number, because the mean of its divisors is an integer number (1634284260).

Almost surely, 2^31213233012 is an apocalyptic number.

It is an amenable number.

31213233012 is an abundant number, since it is smaller than the sum of its proper divisors (47232411468).

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

31213233012 is a wasteful number, since it uses less digits than its factorization.

31213233012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31632 (or 31630 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 31213233012 its reverse (21033231213), we get a palindrome (52246464225).

The spelling of 31213233012 in words is "thirty-one billion, two hundred thirteen million, two hundred thirty-three thousand, twelve".