921332421 has 8 divisors (see below), whose sum is σ = 1364936960. Its totient is φ = 614221596.

The previous prime is 921332417. The next prime is 921332441. The reversal of 921332421 is 124233129.

It is a happy number.

It is not a de Polignac number, because 921332421 - 2² = 921332417 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 34123423 = 921332421 / (9 + 2 + 1 + 3 + 3 + 2 + 4 + 2 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (921332441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17061685 + ... + 17061738.

It is an arithmetic number, because the mean of its divisors is an integer number (170617120).

Almost surely, 2^921332421 is an apocalyptic number.

It is an amenable number.

921332421 is a deficient number, since it is larger than the sum of its proper divisors (443604539).

921332421 is a wasteful number, since it uses less digits than its factorization.

921332421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34123432 (or 34123426 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 921332421 is about 30353.4581390655. The cubic root of 921332421 is about 973.0581279109.

The spelling of 921332421 in words is "nine hundred twenty-one million, three hundred thirty-two thousand, four hundred twenty-one".