31231021122 has 60 divisors (see below), whose sum is σ = 81406049670. Its totient is φ = 8923146624.

The previous prime is 31231021103. The next prime is 31231021139. The reversal of 31231021122 is 22112013213.

31231021122 is a `hidden beast` number, since 312 + 310 + 21 + 1 + 22 = 666.

It can be written as a sum of positive squares in only one way, i.e., 29213304561 + 2017716561 = 170919^2 + 44919^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 31231021095 and 31231021104.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 1959247 + ... + 1975122.

Almost surely, 2^31231021122 is an apocalyptic number.

31231021122 is an abundant number, since it is smaller than the sum of its proper divisors (50175028548).

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

31231021122 is a wasteful number, since it uses less digits than its factorization.

31231021122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3934397 (or 3934381 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 31231021122 its reverse (22112013213), we get a palindrome (53343034335).

The spelling of 31231021122 in words is "thirty-one billion, two hundred thirty-one million, twenty-one thousand, one hundred twenty-two".