31122321220 has 24 divisors (see below), whose sum is σ = 65381529024. Its totient is φ = 12444232416.

The previous prime is 31122321199. The next prime is 31122321221. The reversal of 31122321220 is 2212322113.

It is not an unprimeable number, because it can be changed into a prime (31122321221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 238914 + ... + 345433.

It is an arithmetic number, because the mean of its divisors is an integer number (2724230376).

Almost surely, 2^31122321220 is an apocalyptic number.

It is an amenable number.

31122321220 is an abundant number, since it is smaller than the sum of its proper divisors (34259207804).

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

31122321220 is a wasteful number, since it uses less digits than its factorization.

31122321220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 587019 (or 587017 counting only the distinct ones).

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

Adding to 31122321220 its reverse (2212322113), we get a palindrome (33334643333).

The spelling of 31122321220 in words is "thirty-one billion, one hundred twenty-two million, three hundred twenty-one thousand, two hundred twenty".