79136129201621 has 4 divisors (see below), whose sum is σ = 79137069156000. Its totient is φ = 79135189247244.

The previous prime is 79136129201603. The next prime is 79136129201641. The reversal of 79136129201621 is 12610292163197.

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 79136129201621 - 2¹⁸ = 79136128939477 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 79136129201621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79136129201641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 469850891 + ... + 470019288.

It is an arithmetic number, because the mean of its divisors is an integer number (19784267289000).

Almost surely, 2^{79136129201621} is an apocalyptic number.

It is an amenable number.

79136129201621 is a deficient number, since it is larger than the sum of its proper divisors (939954379).

79136129201621 is an equidigital number, since it uses as much as digits as its factorization.

79136129201621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 939954378.

The product of its (nonzero) digits is 489888, while the sum is 50.

The spelling of 79136129201621 in words is "seventy-nine trillion, one hundred thirty-six billion, one hundred twenty-nine million, two hundred one thousand, six hundred twenty-one".