31123320312100 has 36 divisors (see below), whose sum is σ = 68392511488000. Its totient is φ = 12291741689760.

The previous prime is 31123320312083. The next prime is 31123320312131. The reversal of 31123320312100 is 121302332113.

It is a super-2 number, since 2×31123320312100² (a number of 28 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, 1969822500 + ... + 1969838299.

Almost surely, 2^{31123320312100} is an apocalyptic number.

It is an amenable number.

31123320312100 is an abundant number, since it is smaller than the sum of its proper divisors (37269191175900).

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

31123320312100 is a wasteful number, since it uses less digits than its factorization.

31123320312100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3939660892 (or 3939660885 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 31123320312100 its reverse (121302332113), we get a palindrome (31244622644213).

The spelling of 31123320312100 in words is "thirty-one trillion, one hundred twenty-three billion, three hundred twenty million, three hundred twelve thousand, one hundred".