329381021 has 2 divisors, whose sum is σ = 329381022. Its totient is φ = 329381020.

The previous prime is 329380951. The next prime is 329381023. The reversal of 329381021 is 120183923.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 253255396 + 76125625 = 15914^2 + 8725^2 .

It is an emirp because it is prime and its reverse (120183923) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 329381021 - 2²² = 325186717 is a prime.

It is a Sophie Germain prime.

Together with 329381023, it forms a pair of twin primes.

It is a Chen 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 (329381023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 164690510 + 164690511.

It is an arithmetic number, because the mean of its divisors is an integer number (164690511).

Almost surely, 2^329381021 is an apocalyptic number.

It is an amenable number.

329381021 is a deficient number, since it is larger than the sum of its proper divisors (1).

329381021 is an equidigital number, since it uses as much as digits as its factorization.

329381021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 329381021 is about 18148.8572918517. The cubic root of 329381021 is about 690.6099912820.

The spelling of 329381021 in words is "three hundred twenty-nine million, three hundred eighty-one thousand, twenty-one".