79020421 has 4 divisors (see below), whose sum is σ = 79101792. Its totient is φ = 78939052.

The previous prime is 79020401. The next prime is 79020427. The reversal of 79020421 is 12402097.

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 79020421 - 2⁹ = 79019909 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 (79020427) 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, 39211 + ... + 41176.

It is an arithmetic number, because the mean of its divisors is an integer number (19775448).

Almost surely, 2^79020421 is an apocalyptic number.

It is an amenable number.

79020421 is a deficient number, since it is larger than the sum of its proper divisors (81371).

79020421 is an equidigital number, since it uses as much as digits as its factorization.

79020421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81370.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 79020421 is about 8889.3431140889. The cubic root of 79020421 is about 429.1210113539.

The spelling of 79020421 in words is "seventy-nine million, twenty thousand, four hundred twenty-one".