31211200531212 has 72 divisors (see below), whose sum is σ = 78863109825024. Its totient is φ = 9602954202816.

The previous prime is 31211200531177. The next prime is 31211200531213. The reversal of 31211200531212 is 21213500211213.

It is not an unprimeable number, because it can be changed into a prime (31211200531213) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 40222333 + ... + 40990955.

It is an arithmetic number, because the mean of its divisors is an integer number (1095320969792).

Almost surely, 2^{31211200531212} is an apocalyptic number.

It is an amenable number.

31211200531212 is an abundant number, since it is smaller than the sum of its proper divisors (47651909293812).

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

31211200531212 is a wasteful number, since it uses less digits than its factorization.

31211200531212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 788679 (or 788664 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 24.

Adding to 31211200531212 its reverse (21213500211213), we get a palindrome (52424700742425).

The spelling of 31211200531212 in words is "thirty-one trillion, two hundred eleven billion, two hundred million, five hundred thirty-one thousand, two hundred twelve".