31220113323 has 16 divisors (see below), whose sum is σ = 47725508096. Its totient is φ = 17783064000.

The previous prime is 31220113319. The next prime is 31220113349. The reversal of 31220113323 is 32331102213.

It is not a de Polignac number, because 31220113323 - 2² = 31220113319 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 31220113323.

It is not an unprimeable number, because it can be changed into a prime (31220113373) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2368303 + ... + 2381448.

It is an arithmetic number, because the mean of its divisors is an integer number (2982844256).

Almost surely, 2^31220113323 is an apocalyptic number.

31220113323 is a deficient number, since it is larger than the sum of its proper divisors (16505394773).

31220113323 is a wasteful number, since it uses less digits than its factorization.

31220113323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4750074.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 31220113323 its reverse (32331102213), we get a palindrome (63551215536).

The spelling of 31220113323 in words is "thirty-one billion, two hundred twenty million, one hundred thirteen thousand, three hundred twenty-three".