31013013220 has 24 divisors (see below), whose sum is σ = 74431232064. Its totient is φ = 10633033056.

The previous prime is 31013013197. The next prime is 31013013223. The reversal of 31013013220 is 2231031013.

It is a super-3 number, since 3×31013013220³ (a number of 32 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31013013194 and 31013013203.

It is not an unprimeable number, because it can be changed into a prime (31013013223) 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, 110760622 + ... + 110760901.

It is an arithmetic number, because the mean of its divisors is an integer number (3101301336).

Almost surely, 2^31013013220 is an apocalyptic number.

It is an amenable number.

31013013220 is an abundant number, since it is smaller than the sum of its proper divisors (43418218844).

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

31013013220 is a wasteful number, since it uses less digits than its factorization.

31013013220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221521539 (or 221521537 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 31013013220 its reverse (2231031013), we get a palindrome (33244044233).

The spelling of 31013013220 in words is "thirty-one billion, thirteen million, thirteen thousand, two hundred twenty".