326427721 has 2 divisors, whose sum is σ = 326427722. Its totient is φ = 326427720.

The previous prime is 326427713. The next prime is 326427743. The reversal of 326427721 is 127724623.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 274068025 + 52359696 = 16555^2 + 7236^2 .

It is a cyclic number.

It is not a de Polignac number, because 326427721 - 2³ = 326427713 is a prime.

It is not a weakly prime, because it can be changed into another prime (326427781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 163213860 + 163213861.

It is an arithmetic number, because the mean of its divisors is an integer number (163213861).

Almost surely, 2^326427721 is an apocalyptic number.

It is an amenable number.

326427721 is a deficient number, since it is larger than the sum of its proper divisors (1).

326427721 is an equidigital number, since it uses as much as digits as its factorization.

326427721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28224, while the sum is 34.

The square root of 326427721 is about 18067.3108402994. The cubic root of 326427721 is about 688.5397396401.

The spelling of 326427721 in words is "three hundred twenty-six million, four hundred twenty-seven thousand, seven hundred twenty-one".