79521021642 has 8 divisors (see below), whose sum is σ = 159042043296. Its totient is φ = 26507007212.

The previous prime is 79521021631. The next prime is 79521021653. The reversal of 79521021642 is 24612012597.

It is an interprime number because it is at equal distance from previous prime (79521021631) and next prime (79521021653).

It is a sphenic number, since it is the product of 3 distinct primes.

79521021642 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 79521021642.

It is an unprimeable number.

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, 6626751798 + ... + 6626751809.

It is an arithmetic number, because the mean of its divisors is an integer number (19880255412).

Almost surely, 2^79521021642 is an apocalyptic number.

79521021642 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

79521021642 is a wasteful number, since it uses less digits than its factorization.

79521021642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13253503612.

The product of its (nonzero) digits is 60480, while the sum is 39.

The spelling of 79521021642 in words is "seventy-nine billion, five hundred twenty-one million, twenty-one thousand, six hundred forty-two".