31032213012 has 18 divisors (see below), whose sum is σ = 78442538538. Its totient is φ = 10344070992.

The previous prime is 31032213001. The next prime is 31032213013. The reversal of 31032213012 is 21031223013.

31032213012 is a `hidden beast` number, since 310 + 32 + 21 + 301 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 20884874256 + 10147338756 = 144516^2 + 100734^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×31032213012² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31032213013) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 431002923 + ... + 431002994.

Almost surely, 2^31032213012 is an apocalyptic number.

It is an amenable number.

31032213012 is an abundant number, since it is smaller than the sum of its proper divisors (47410325526).

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

31032213012 is a wasteful number, since it uses less digits than its factorization.

31032213012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 862005927 (or 862005922 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 31032213012 its reverse (21031223013), we get a palindrome (52063436025).

The spelling of 31032213012 in words is "thirty-one billion, thirty-two million, two hundred thirteen thousand, twelve".