79012111021 has 4 divisors (see below), whose sum is σ = 83170643200. Its totient is φ = 74853578844.

The previous prime is 79012110959. The next prime is 79012111027. The reversal of 79012111021 is 12011121097.

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 79012111021 - 2⁹ = 79012110509 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 (79012111027) 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 3 ways as a sum of consecutive naturals, for example, 2079266061 + ... + 2079266098.

It is an arithmetic number, because the mean of its divisors is an integer number (20792660800).

Almost surely, 2^79012111021 is an apocalyptic number.

It is an amenable number.

79012111021 is a deficient number, since it is larger than the sum of its proper divisors (4158532179).

79012111021 is a wasteful number, since it uses less digits than its factorization.

79012111021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4158532178.

The product of its (nonzero) digits is 252, while the sum is 25.

The spelling of 79012111021 in words is "seventy-nine billion, twelve million, one hundred eleven thousand, twenty-one".