31032221020 has 48 divisors (see below), whose sum is σ = 65424643200. Its totient is φ = 12364038720.

The previous prime is 31032220979. The next prime is 31032221027. The reversal of 31032221020 is 2012223013.

It is a junction number, because it is equal to n+sod(n) for n = 31032220985 and 31032221003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31032221027) 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 15 ways as a sum of consecutive naturals, for example, 6190315 + ... + 6195325.

It is an arithmetic number, because the mean of its divisors is an integer number (1363013400).

Almost surely, 2^31032221020 is an apocalyptic number.

It is an amenable number.

31032221020 is an abundant number, since it is smaller than the sum of its proper divisors (34392422180).

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

31032221020 is a wasteful number, since it uses less digits than its factorization.

31032221020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6178 (or 6176 counting only the distinct ones).

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

Adding to 31032221020 its reverse (2012223013), we get a palindrome (33044444033).

The spelling of 31032221020 in words is "thirty-one billion, thirty-two million, two hundred twenty-one thousand, twenty".