31122234521 has 16 divisors (see below), whose sum is σ = 36115618176. Its totient is φ = 26266052736.

The previous prime is 31122234511. The next prime is 31122234527. The reversal of 31122234521 is 12543222113.

It is a de Polignac number, because none of the positive numbers 2^k-31122234521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31122234527) 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, 1100855 + ... + 1128771.

It is an arithmetic number, because the mean of its divisors is an integer number (2257226136).

Almost surely, 2^31122234521 is an apocalyptic number.

It is an amenable number.

31122234521 is a deficient number, since it is larger than the sum of its proper divisors (4993383655).

31122234521 is a wasteful number, since it uses less digits than its factorization.

31122234521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30368.

The product of its digits is 2880, while the sum is 26.

Adding to 31122234521 its reverse (12543222113), we get a palindrome (43665456634).

The spelling of 31122234521 in words is "thirty-one billion, one hundred twenty-two million, two hundred thirty-four thousand, five hundred twenty-one".