7921321424 has 20 divisors (see below), whose sum is σ = 15375634944. Its totient is φ = 3953415648.

The previous prime is 7921321423. The next prime is 7921321427. The reversal of 7921321424 is 4241231297.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7921321423) 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, 443792 + ... + 461295.

Almost surely, 2^7921321424 is an apocalyptic number.

It is an amenable number.

7921321424 is a deficient number, since it is larger than the sum of its proper divisors (7454313520).

7921321424 is a wasteful number, since it uses less digits than its factorization.

7921321424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 905642 (or 905636 counting only the distinct ones).

The product of its digits is 24192, while the sum is 35.

The square root of 7921321424 is about 89001.8057344906. The cubic root of 7921321424 is about 1993.4218396240.

The spelling of 7921321424 in words is "seven billion, nine hundred twenty-one million, three hundred twenty-one thousand, four hundred twenty-four".