31213312244 has 24 divisors (see below), whose sum is σ = 55477571520. Its totient is φ = 15362905536.

The previous prime is 31213312237. The next prime is 31213312297. The reversal of 31213312244 is 44221331213.

It is a super-2 number, since 2×31213312244² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 347552 + ... + 428040.

It is an arithmetic number, because the mean of its divisors is an integer number (2311565480).

Almost surely, 2^31213312244 is an apocalyptic number.

It is an amenable number.

31213312244 is a deficient number, since it is larger than the sum of its proper divisors (24264259276).

31213312244 is a wasteful number, since it uses less digits than its factorization.

31213312244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82007 (or 82005 counting only the distinct ones).

The product of its digits is 3456, while the sum is 26.

Adding to 31213312244 its reverse (44221331213), we get a palindrome (75434643457).

The spelling of 31213312244 in words is "thirty-one billion, two hundred thirteen million, three hundred twelve thousand, two hundred forty-four".