331230021021 has 12 divisors (see below), whose sum is σ = 478448573148. Its totient is φ = 220817609664.

The previous prime is 331230020921. The next prime is 331230021053. The reversal of 331230021021 is 120120032133.

331230021021 is a `hidden beast` number, since 331 + 2 + 300 + 2 + 10 + 21 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 65784555225 + 265445465796 = 256485^2 + 515214^2 .

It is not a de Polignac number, because 331230021021 - 2¹³ = 331230012829 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 331230020985 and 331230021003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331230021071) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1153891 + ... + 1412063.

It is an arithmetic number, because the mean of its divisors is an integer number (39870714429).

Almost surely, 2^331230021021 is an apocalyptic number.

It is an amenable number.

331230021021 is a deficient number, since it is larger than the sum of its proper divisors (147218552127).

331230021021 is a wasteful number, since it uses less digits than its factorization.

331230021021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400732 (or 400729 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 331230021021 its reverse (120120032133), we get a palindrome (451350053154).

The spelling of 331230021021 in words is "three hundred thirty-one billion, two hundred thirty million, twenty-one thousand, twenty-one".