31321121131220 has 24 divisors (see below), whose sum is σ = 65776342126824. Its totient is φ = 12528069833216.

The previous prime is 31321121131219. The next prime is 31321121131229. The reversal of 31321121131220 is 2213112112313.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 102730506256 + 31218390624964 = 320516^2 + 5587342^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31321121131229) 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, 22984889 + ... + 24309408.

It is an arithmetic number, because the mean of its divisors is an integer number (2740680921951).

Almost surely, 2^{31321121131220} is an apocalyptic number.

It is an amenable number.

31321121131220 is an abundant number, since it is smaller than the sum of its proper divisors (34455220995604).

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

31321121131220 is a wasteful number, since it uses less digits than its factorization.

31321121131220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47327419 (or 47327417 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 23.

Adding to 31321121131220 its reverse (2213112112313), we get a palindrome (33534233243533).

The spelling of 31321121131220 in words is "thirty-one trillion, three hundred twenty-one billion, one hundred twenty-one million, one hundred thirty-one thousand, two hundred twenty".