31312213102220 has 24 divisors (see below), whose sum is σ = 65757311225424. Its totient is φ = 12524568343616.

The previous prime is 31312213102213. The next prime is 31312213102223. The reversal of 31312213102220 is 2220131221313.

It is not an unprimeable number, because it can be changed into a prime (31312213102223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18995039 + ... + 20577558.

It is an arithmetic number, because the mean of its divisors is an integer number (2739887967726).

Almost surely, 2^{31312213102220} is an apocalyptic number.

It is an amenable number.

31312213102220 is an abundant number, since it is smaller than the sum of its proper divisors (34445098123204).

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

31312213102220 is a wasteful number, since it uses less digits than its factorization.

31312213102220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39612169 (or 39612167 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 31312213102220 its reverse (2220131221313), we get a palindrome (33532344323533).

The spelling of 31312213102220 in words is "thirty-one trillion, three hundred twelve billion, two hundred thirteen million, one hundred two thousand, two hundred twenty".