31312221320220 has 48 divisors (see below), whose sum is σ = 88525425730560. Its totient is φ = 8268858444096.

The previous prime is 31312221320197. The next prime is 31312221320239. The reversal of 31312221320220 is 2202312221313.

It is a congruent number.

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, 2533345060 + ... + 2533357419.

It is an arithmetic number, because the mean of its divisors is an integer number (1844279702720).

Almost surely, 2^{31312221320220} is an apocalyptic number.

31312221320220 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31312221320220 is an abundant number, since it is smaller than the sum of its proper divisors (57213204410340).

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

31312221320220 is a wasteful number, since it uses less digits than its factorization.

31312221320220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5066702594 (or 5066702592 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 31312221320220 its reverse (2202312221313), we get a palindrome (33514533541533).

The spelling of 31312221320220 in words is "thirty-one trillion, three hundred twelve billion, two hundred twenty-one million, three hundred twenty thousand, two hundred twenty".