31323120100 has 36 divisors (see below), whose sum is σ = 67979024064. Its totient is φ = 12527800480.

The previous prime is 31323120053. The next prime is 31323120121. The reversal of 31323120100 is 102132313.

It is a super-2 number, since 2×31323120100² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1421769 + ... + 1443631.

It is an arithmetic number, because the mean of its divisors is an integer number (1888306224).

Almost surely, 2^31323120100 is an apocalyptic number.

It is an amenable number.

31323120100 is an abundant number, since it is smaller than the sum of its proper divisors (36655903964).

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

31323120100 is a wasteful number, since it uses less digits than its factorization.

31323120100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36204 (or 36197 counting only the distinct ones).

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

Adding to 31323120100 its reverse (102132313), we get a palindrome (31425252413).

The spelling of 31323120100 in words is "thirty-one billion, three hundred twenty-three million, one hundred twenty thousand, one hundred".