31213121012200 has 24 divisors (see below), whose sum is σ = 72570506353830. Its totient is φ = 12485248404800.

The previous prime is 31213121012189. The next prime is 31213121012239. The reversal of 31213121012200 is 221012131213.

It can be written as a sum of positive squares in 3 ways, for example, as 29635981883236 + 1577139128964 = 5443894^2 + 1255842^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 78032802331 + ... + 78032802730.

Almost surely, 2^{31213121012200} is an apocalyptic number.

It is an amenable number.

31213121012200 is an abundant number, since it is smaller than the sum of its proper divisors (41357385341630).

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

31213121012200 is a wasteful number, since it uses less digits than its factorization.

31213121012200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156065605077 (or 156065605068 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 31213121012200 its reverse (221012131213), we get a palindrome (31434133143413).

The spelling of 31213121012200 in words is "thirty-one trillion, two hundred thirteen billion, one hundred twenty-one million, twelve thousand, two hundred".