31213023100 has 36 divisors (see below), whose sum is σ = 77408299024. Its totient is φ = 10701607680.

The previous prime is 31213023073. The next prime is 31213023109. The reversal of 31213023100 is 132031213.

It is a super-2 number, since 2×31213023100² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31213023109) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22294317 + ... + 22295716.

Almost surely, 2^31213023100 is an apocalyptic number.

It is an amenable number.

31213023100 is an abundant number, since it is smaller than the sum of its proper divisors (46195275924).

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

31213023100 is a wasteful number, since it uses less digits than its factorization.

31213023100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44590054 (or 44590047 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 31213023100 its reverse (132031213), we get a palindrome (31345054313).

The spelling of 31213023100 in words is "thirty-one billion, two hundred thirteen million, twenty-three thousand, one hundred".