31122123220 has 48 divisors (see below), whose sum is σ = 66175542720. Its totient is φ = 12292978176.

The previous prime is 31122123211. The next prime is 31122123251. The reversal of 31122123220 is 2232122113.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5496751 + ... + 5502409.

It is an arithmetic number, because the mean of its divisors is an integer number (1378657140).

Almost surely, 2^31122123220 is an apocalyptic number.

It is an amenable number.

31122123220 is an abundant number, since it is smaller than the sum of its proper divisors (35053419500).

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

31122123220 is a wasteful number, since it uses less digits than its factorization.

31122123220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9064 (or 9062 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 31122123220 its reverse (2232122113), we get a palindrome (33354245333).

The spelling of 31122123220 in words is "thirty-one billion, one hundred twenty-two million, one hundred twenty-three thousand, two hundred twenty".