31222121204 has 12 divisors (see below), whose sum is σ = 54645991428. Its totient is φ = 15608980800.

The previous prime is 31222121159. The next prime is 31222121207. The reversal of 31222121204 is 40212122213.

It can be written as a sum of positive squares in 2 ways, for example, as 21963832804 + 9258288400 = 148202^2 + 96220^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31222121207) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 485927 + ... + 546414.

It is an arithmetic number, because the mean of its divisors is an integer number (4553832619).

Almost surely, 2^31222121204 is an apocalyptic number.

It is an amenable number.

31222121204 is a deficient number, since it is larger than the sum of its proper divisors (23423870224).

31222121204 is a wasteful number, since it uses less digits than its factorization.

31222121204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1039906 (or 1039904 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 31222121204 its reverse (40212122213), we get a palindrome (71434243417).

The spelling of 31222121204 in words is "thirty-one billion, two hundred twenty-two million, one hundred twenty-one thousand, two hundred four".