401327921 has 4 divisors (see below), whose sum is σ = 402031344. Its totient is φ = 400624500.

The previous prime is 401327903. The next prime is 401327947. The reversal of 401327921 is 129723104.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 401327921 - 2²⁶ = 334219057 is a prime.

It is a super-2 number, since 2×401327921² = 322128200348364482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (401323921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 350855 + ... + 351996.

It is an arithmetic number, because the mean of its divisors is an integer number (100507836).

Almost surely, 2^401327921 is an apocalyptic number.

It is an amenable number.

401327921 is a deficient number, since it is larger than the sum of its proper divisors (703423).

401327921 is an equidigital number, since it uses as much as digits as its factorization.

401327921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 703422.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 401327921 is about 20033.1705179185. The cubic root of 401327921 is about 737.6207495863.

The spelling of 401327921 in words is "four hundred one million, three hundred twenty-seven thousand, nine hundred twenty-one".