329979722021 has 2 divisors, whose sum is σ = 329979722022. Its totient is φ = 329979722020.

The previous prime is 329979721961. The next prime is 329979722041. The reversal of 329979722021 is 120227979923.

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., 318378062500 + 11601659521 = 564250^2 + 107711^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-329979722021 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (329979722041) 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, 164989861010 + 164989861011.

It is an arithmetic number, because the mean of its divisors is an integer number (164989861011).

Almost surely, 2^329979722021 is an apocalyptic number.

It is an amenable number.

329979722021 is a deficient number, since it is larger than the sum of its proper divisors (1).

329979722021 is an equidigital number, since it uses as much as digits as its factorization.

329979722021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1714608, while the sum is 53.

The spelling of 329979722021 in words is "three hundred twenty-nine billion, nine hundred seventy-nine million, seven hundred twenty-two thousand, twenty-one".