31321312311220 has 48 divisors (see below), whose sum is σ = 66710021793408. Its totient is φ = 12350425915520.

The previous prime is 31321312311197. The next prime is 31321312311229. The reversal of 31321312311220 is 2211321312313.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31321312311229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9255414 + ... + 12178066.

It is an arithmetic number, because the mean of its divisors is an integer number (1389792120696).

Almost surely, 2^{31321312311220} is an apocalyptic number.

It is an amenable number.

31321312311220 is an abundant number, since it is smaller than the sum of its proper divisors (35388709482188).

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

31321312311220 is a wasteful number, since it uses less digits than its factorization.

31321312311220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2930280 (or 2930278 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 25.

Adding to 31321312311220 its reverse (2211321312313), we get a palindrome (33532633623533).

The spelling of 31321312311220 in words is "thirty-one trillion, three hundred twenty-one billion, three hundred twelve million, three hundred eleven thousand, two hundred twenty".