31113213320 has 64 divisors (see below), whose sum is σ = 80092195200. Its totient is φ = 10655815680.

The previous prime is 31113213311. The next prime is 31113213337. The reversal of 31113213320 is 2331231113.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 31113213292 and 31113213301.

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, 200315 + ... + 319925.

It is an arithmetic number, because the mean of its divisors is an integer number (1251440550).

Almost surely, 2^31113213320 is an apocalyptic number.

It is an amenable number.

31113213320 is an abundant number, since it is smaller than the sum of its proper divisors (48978981880).

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

31113213320 is a wasteful number, since it uses less digits than its factorization.

31113213320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120558 (or 120554 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 31113213320 its reverse (2331231113), we get a palindrome (33444444433).

The spelling of 31113213320 in words is "thirty-one billion, one hundred thirteen million, two hundred thirteen thousand, three hundred twenty".