31231013212100 has 72 divisors (see below), whose sum is σ = 75338813507328. Its totient is φ = 11159468726400.

The previous prime is 31231013212081. The next prime is 31231013212129. The reversal of 31231013212100 is 121231013213.

It is a happy number.

It is a super-3 number, since 3×31231013212100³ (a number of 41 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 387441254 + ... + 387521853.

It is an arithmetic number, because the mean of its divisors is an integer number (1046372409824).

Almost surely, 2^{31231013212100} is an apocalyptic number.

It is an amenable number.

31231013212100 is an abundant number, since it is smaller than the sum of its proper divisors (44107800295228).

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

31231013212100 is a wasteful number, since it uses less digits than its factorization.

31231013212100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 774963165 (or 774963158 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 31231013212100 its reverse (121231013213), we get a palindrome (31352244225313).

The spelling of 31231013212100 in words is "thirty-one trillion, two hundred thirty-one billion, thirteen million, two hundred twelve thousand, one hundred".