329684969021 has 2 divisors, whose sum is σ = 329684969022. Its totient is φ = 329684969020.

The previous prime is 329684969017. The next prime is 329684969083. The reversal of 329684969021 is 120969486923.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 232072464121 + 97612504900 = 481739^2 + 312430^2 .

It is a cyclic number.

It is not a de Polignac number, because 329684969021 - 2² = 329684969017 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (329684969321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 164842484510 + 164842484511.

It is an arithmetic number, because the mean of its divisors is an integer number (164842484511).

Almost surely, 2^329684969021 is an apocalyptic number.

It is an amenable number.

329684969021 is a deficient number, since it is larger than the sum of its proper divisors (1).

329684969021 is an equidigital number, since it uses as much as digits as its factorization.

329684969021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10077696, while the sum is 59.

The spelling of 329684969021 in words is "three hundred twenty-nine billion, six hundred eighty-four million, nine hundred sixty-nine thousand, twenty-one".