79420202021 has 12 divisors (see below), whose sum is σ = 80834273772. Its totient is φ = 78030469824.

The previous prime is 79420201997. The next prime is 79420202077. The reversal of 79420202021 is 12020202497.

It can be written as a sum of positive squares in 2 ways, for example, as 4022730625 + 75397471396 = 63425^2 + 274586^2 .

It is not a de Polignac number, because 79420202021 - 2²² = 79416007717 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 (79420202621) 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 11 ways as a sum of consecutive naturals, for example, 7489295 + ... + 7499891.

It is an arithmetic number, because the mean of its divisors is an integer number (6736189481).

Almost surely, 2^79420202021 is an apocalyptic number.

It is an amenable number.

79420202021 is a deficient number, since it is larger than the sum of its proper divisors (1414071751).

79420202021 is a wasteful number, since it uses less digits than its factorization.

79420202021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12868 (or 12809 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 29.

The spelling of 79420202021 in words is "seventy-nine billion, four hundred twenty million, two hundred two thousand, twenty-one".