31313312222 has 4 divisors (see below), whose sum is σ = 46969968336. Its totient is φ = 15656656110.

The previous prime is 31313312221. The next prime is 31313312227. The reversal of 31313312222 is 22221331313.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31313312221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7828328054 + ... + 7828328057.

It is an arithmetic number, because the mean of its divisors is an integer number (11742492084).

Almost surely, 2^31313312222 is an apocalyptic number.

31313312222 is a deficient number, since it is larger than the sum of its proper divisors (15656656114).

31313312222 is a wasteful number, since it uses less digits than its factorization.

31313312222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15656656113.

The product of its digits is 1296, while the sum is 23.

Adding to 31313312222 its reverse (22221331313), we get a palindrome (53534643535).

The spelling of 31313312222 in words is "thirty-one billion, three hundred thirteen million, three hundred twelve thousand, two hundred twenty-two".