331230020521 has 2 divisors, whose sum is σ = 331230020522. Its totient is φ = 331230020520.

The previous prime is 331230020503. The next prime is 331230020533. The reversal of 331230020521 is 125020032133.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 205967114896 + 125262905625 = 453836^2 + 353925^2 .

It is a cyclic number.

It is not a de Polignac number, because 331230020521 - 2⁵ = 331230020489 is a prime.

It is a super-2 number, since 2×331230020521² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 331230020492 and 331230020501.

It is not a weakly prime, because it can be changed into another prime (331230020581) 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 as a sum of consecutive naturals, namely, 165615010260 + 165615010261.

It is an arithmetic number, because the mean of its divisors is an integer number (165615010261).

Almost surely, 2^331230020521 is an apocalyptic number.

It is an amenable number.

331230020521 is a deficient number, since it is larger than the sum of its proper divisors (1).

331230020521 is an equidigital number, since it uses as much as digits as its factorization.

331230020521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1080, while the sum is 22.

Adding to 331230020521 its reverse (125020032133), we get a palindrome (456250052654).

The spelling of 331230020521 in words is "three hundred thirty-one billion, two hundred thirty million, twenty thousand, five hundred twenty-one".