331121021221979 has 2 divisors, whose sum is σ = 331121021221980. Its totient is φ = 331121021221978.

The previous prime is 331121021221967. The next prime is 331121021221999. The reversal of 331121021221979 is 979122120121133.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-331121021221979 is a prime.

It is a super-2 number, since 2×331121021221979² (a number of 30 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (331121021221999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165560510610989 + 165560510610990.

It is an arithmetic number, because the mean of its divisors is an integer number (165560510610990).

Almost surely, 2^{331121021221979} is an apocalyptic number.

331121021221979 is a deficient number, since it is larger than the sum of its proper divisors (1).

331121021221979 is an equidigital number, since it uses as much as digits as its factorization.

331121021221979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81648, while the sum is 44.

The spelling of 331121021221979 in words is "three hundred thirty-one trillion, one hundred twenty-one billion, twenty-one million, two hundred twenty-one thousand, nine hundred seventy-nine".