7231921 has 4 divisors (see below), whose sum is σ = 7241200. Its totient is φ = 7222644.

The previous prime is 7231907. The next prime is 7231943. The reversal of 7231921 is 1291327.

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 7231921 - 2⁷ = 7231793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7231981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3351 + ... + 5068.

It is an arithmetic number, because the mean of its divisors is an integer number (1810300).

Almost surely, 2^7231921 is an apocalyptic number.

It is an amenable number.

7231921 is a deficient number, since it is larger than the sum of its proper divisors (9279).

7231921 is an equidigital number, since it uses as much as digits as its factorization.

7231921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9278.

The product of its digits is 756, while the sum is 25.

The square root of 7231921 is about 2689.2231220187. The cubic root of 7231921 is about 193.3828209291.

The spelling of 7231921 in words is "seven million, two hundred thirty-one thousand, nine hundred twenty-one".