7999641421 has 8 divisors (see below), whose sum is σ = 8423330400. Its totient is φ = 7576218000.

The previous prime is 7999641409. The next prime is 7999641451. The reversal of 7999641421 is 1241469997.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7999641421 - 2²³ = 7991252813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7999641451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2986 + ... + 126523.

It is an arithmetic number, because the mean of its divisors is an integer number (1052916300).

Almost surely, 2^7999641421 is an apocalyptic number.

It is an amenable number.

7999641421 is a deficient number, since it is larger than the sum of its proper divisors (423688979).

7999641421 is a wasteful number, since it uses less digits than its factorization.

7999641421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132779.

The product of its digits is 979776, while the sum is 52.

The square root of 7999641421 is about 89440.7145599810. The cubic root of 7999641421 is about 1999.9701179702.

The spelling of 7999641421 in words is "seven billion, nine hundred ninety-nine million, six hundred forty-one thousand, four hundred twenty-one".