31212402100 has 72 divisors (see below), whose sum is σ = 75690530496. Its totient is φ = 11073120000.

The previous prime is 31212402097. The next prime is 31212402107. The reversal of 31212402100 is 120421213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31212402107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 300936 + ... + 391135.

It is an arithmetic number, because the mean of its divisors is an integer number (1051257368).

Almost surely, 2^31212402100 is an apocalyptic number.

It is an amenable number.

31212402100 is an abundant number, since it is smaller than the sum of its proper divisors (44478128396).

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

31212402100 is a wasteful number, since it uses less digits than its factorization.

31212402100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 692137 (or 692130 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 31212402100 its reverse (120421213), we get a palindrome (31332823313).

The spelling of 31212402100 in words is "thirty-one billion, two hundred twelve million, four hundred two thousand, one hundred".