31023312213220 has 48 divisors (see below), whose sum is σ = 65183726463408. Its totient is φ = 12402703480320.

The previous prime is 31023312213199. The next prime is 31023312213287. The reversal of 31023312213220 is 2231221332013.

It can be written as a sum of positive squares in 8 ways, for example, as 382747619556 + 30640564593664 = 618666^2 + 5535392^2 .

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, 338559010 + ... + 338650630.

It is an arithmetic number, because the mean of its divisors is an integer number (1357994301321).

Almost surely, 2^{31023312213220} is an apocalyptic number.

It is an amenable number.

31023312213220 is an abundant number, since it is smaller than the sum of its proper divisors (34160414250188).

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

31023312213220 is a wasteful number, since it uses less digits than its factorization.

31023312213220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100480 (or 100478 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 25.

Adding to 31023312213220 its reverse (2231221332013), we get a palindrome (33254533545233).

The spelling of 31023312213220 in words is "thirty-one trillion, twenty-three billion, three hundred twelve million, two hundred thirteen thousand, two hundred twenty".