31221330020 has 48 divisors (see below), whose sum is σ = 65913281280. Its totient is φ = 12422274816.

The previous prime is 31221330001. The next prime is 31221330031. The reversal of 31221330020 is 2003312213.

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, 4934579 + ... + 4940901.

It is an arithmetic number, because the mean of its divisors is an integer number (1373193360).

Almost surely, 2^31221330020 is an apocalyptic number.

It is an amenable number.

31221330020 is an abundant number, since it is smaller than the sum of its proper divisors (34691951260).

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

31221330020 is a wasteful number, since it uses less digits than its factorization.

31221330020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7604 (or 7602 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 17.

Adding to 31221330020 its reverse (2003312213), we get a palindrome (33224642233).

The spelling of 31221330020 in words is "thirty-one billion, two hundred twenty-one million, three hundred thirty thousand, twenty".