7919622421 has 4 divisors (see below), whose sum is σ = 8175094144. Its totient is φ = 7664150700.

The previous prime is 7919622401. The next prime is 7919622437. The reversal of 7919622421 is 1242269197.

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 7919622421 - 2⁹ = 7919621909 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 (7919622401) 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, 127735815 + ... + 127735876.

It is an arithmetic number, because the mean of its divisors is an integer number (2043773536).

Almost surely, 2^7919622421 is an apocalyptic number.

It is an amenable number.

7919622421 is a deficient number, since it is larger than the sum of its proper divisors (255471723).

7919622421 is a wasteful number, since it uses less digits than its factorization.

7919622421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255471722.

The product of its digits is 108864, while the sum is 43.

The square root of 7919622421 is about 88992.2604556149. The cubic root of 7919622421 is about 1993.2793098753.

The spelling of 7919622421 in words is "seven billion, nine hundred nineteen million, six hundred twenty-two thousand, four hundred twenty-one".