921327321 has 4 divisors (see below), whose sum is σ = 1228436432. Its totient is φ = 614218212.

The previous prime is 921327313. The next prime is 921327349. The reversal of 921327321 is 123723129.

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 not a de Polignac number, because 921327321 - 2³ = 921327313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (921327301) 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, 153554551 + ... + 153554556.

It is an arithmetic number, because the mean of its divisors is an integer number (307109108).

Almost surely, 2^921327321 is an apocalyptic number.

It is an amenable number.

921327321 is a deficient number, since it is larger than the sum of its proper divisors (307109111).

921327321 is a wasteful number, since it uses less digits than its factorization.

921327321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307109110.

The product of its digits is 4536, while the sum is 30.

The square root of 921327321 is about 30353.3741287521. The cubic root of 921327321 is about 973.0563324657.

The spelling of 921327321 in words is "nine hundred twenty-one million, three hundred twenty-seven thousand, three hundred twenty-one".