84079932021 has 6 divisors (see below), whose sum is σ = 121448790710. Its totient is φ = 56053288008.

The previous prime is 84079932019. The next prime is 84079932067. The reversal of 84079932021 is 12023997048.

It can be written as a sum of positive squares in only one way, i.e., 56686371921 + 27393560100 = 238089^2 + 165510^2 .

It is not a de Polignac number, because 84079932021 - 2¹ = 84079932019 is a prime.

It is a super-2 number, since 2×84079932021² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84079932011) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4671107326 + ... + 4671107343.

Almost surely, 2^84079932021 is an apocalyptic number.

It is an amenable number.

84079932021 is a deficient number, since it is larger than the sum of its proper divisors (37368858689).

84079932021 is a wasteful number, since it uses less digits than its factorization.

84079932021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9342214675 (or 9342214672 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The spelling of 84079932021 in words is "eighty-four billion, seventy-nine million, nine hundred thirty-two thousand, twenty-one".