79020200021 has 4 divisors (see below), whose sum is σ = 90308800032. Its totient is φ = 67731600012.

The previous prime is 79020200011. The next prime is 79020200023. The reversal of 79020200021 is 12000202097.

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 79020200021 - 2¹⁰ = 79020198997 is a prime.

It is a super-2 number, since 2×79020200021² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 79020200021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79020200023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5644299995 + ... + 5644300008.

It is an arithmetic number, because the mean of its divisors is an integer number (22577200008).

Almost surely, 2^79020200021 is an apocalyptic number.

It is an amenable number.

79020200021 is a deficient number, since it is larger than the sum of its proper divisors (11288600011).

79020200021 is a wasteful number, since it uses less digits than its factorization.

79020200021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11288600010.

The product of its (nonzero) digits is 504, while the sum is 23.

The spelling of 79020200021 in words is "seventy-nine billion, twenty million, two hundred thousand, twenty-one".