321131233921 has 2 divisors, whose sum is σ = 321131233922. Its totient is φ = 321131233920.

The previous prime is 321131233901. The next prime is 321131233937. The reversal of 321131233921 is 129332131123.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 314048160000 + 7083073921 = 560400^2 + 84161^2 .

It is a cyclic number.

It is not a de Polignac number, because 321131233921 - 2⁵ = 321131233889 is a prime.

It is not a weakly prime, because it can be changed into another prime (321131233901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160565616960 + 160565616961.

It is an arithmetic number, because the mean of its divisors is an integer number (160565616961).

Almost surely, 2^321131233921 is an apocalyptic number.

It is an amenable number.

321131233921 is a deficient number, since it is larger than the sum of its proper divisors (1).

321131233921 is an equidigital number, since it uses as much as digits as its factorization.

321131233921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5832, while the sum is 31.

The spelling of 321131233921 in words is "three hundred twenty-one billion, one hundred thirty-one million, two hundred thirty-three thousand, nine hundred twenty-one".