31213021330220 has 48 divisors (see below), whose sum is σ = 65647495740288. Its totient is φ = 12466133729280.

The previous prime is 31213021330207. The next prime is 31213021330259. The reversal of 31213021330220 is 2203312031213.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 560540780 + ... + 560596460.

It is an arithmetic number, because the mean of its divisors is an integer number (1367656161256).

Almost surely, 2^{31213021330220} is an apocalyptic number.

It is an amenable number.

31213021330220 is an abundant number, since it is smaller than the sum of its proper divisors (34434474410068).

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

31213021330220 is a wasteful number, since it uses less digits than its factorization.

31213021330220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98010 (or 98008 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 23.

Adding to 31213021330220 its reverse (2203312031213), we get a palindrome (33416333361433).

The spelling of 31213021330220 in words is "thirty-one trillion, two hundred thirteen billion, twenty-one million, three hundred thirty thousand, two hundred twenty".