31312213331020 has 24 divisors (see below), whose sum is σ = 65755762897104. Its totient is φ = 12524863446336.

The previous prime is 31312213331011. The next prime is 31312213331027. The reversal of 31312213331020 is 2013331221313.

It is not an unprimeable number, because it can be changed into a prime (31312213331027) 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, 15343167 + ... + 17263753.

It is an arithmetic number, because the mean of its divisors is an integer number (2739823454046).

Almost surely, 2^{31312213331020} is an apocalyptic number.

It is an amenable number.

31312213331020 is an abundant number, since it is smaller than the sum of its proper divisors (34443549566084).

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

31312213331020 is a wasteful number, since it uses less digits than its factorization.

31312213331020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2735769 (or 2735767 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 25.

Adding to 31312213331020 its reverse (2013331221313), we get a palindrome (33325544552333).

The spelling of 31312213331020 in words is "thirty-one trillion, three hundred twelve billion, two hundred thirteen million, three hundred thirty-one thousand, twenty".