331303223921 has 2 divisors, whose sum is σ = 331303223922. Its totient is φ = 331303223920.

The previous prime is 331303223893. The next prime is 331303223941. The reversal of 331303223921 is 129322303133.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 245187386896 + 86115837025 = 495164^2 + 293455^2 .

It is a cyclic number.

It is not a de Polignac number, because 331303223921 - 2¹⁰ = 331303222897 is a prime.

It is a super-2 number, since 2×331303223921² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (331303223941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165651611960 + 165651611961.

It is an arithmetic number, because the mean of its divisors is an integer number (165651611961).

Almost surely, 2^331303223921 is an apocalyptic number.

It is an amenable number.

331303223921 is a deficient number, since it is larger than the sum of its proper divisors (1).

331303223921 is an equidigital number, since it uses as much as digits as its factorization.

331303223921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17496, while the sum is 32.

The spelling of 331303223921 in words is "three hundred thirty-one billion, three hundred three million, two hundred twenty-three thousand, nine hundred twenty-one".