31223002120 has 32 divisors (see below), whose sum is σ = 70256784600. Its totient is φ = 12488306688.

The previous prime is 31223002087. The next prime is 31223002121. The reversal of 31223002120 is 2120032213.

It can be written as a sum of positive squares in 4 ways, for example, as 14189097924 + 17033904196 = 119118^2 + 130514^2 .

It is a super-2 number, since 2×31223002120² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31223002094 and 31223002103.

It is not an unprimeable number, because it can be changed into a prime (31223002121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1084066 + ... + 1112494.

Almost surely, 2^31223002120 is an apocalyptic number.

It is an amenable number.

31223002120 is an abundant number, since it is smaller than the sum of its proper divisors (39033782480).

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

31223002120 is a wasteful number, since it uses less digits than its factorization.

31223002120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55897 (or 55893 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 31223002120 its reverse (2120032213), we get a palindrome (33343034333).

The spelling of 31223002120 in words is "thirty-one billion, two hundred twenty-three million, two thousand, one hundred twenty".