79101821 has 8 divisors (see below), whose sum is σ = 81962400. Its totient is φ = 76250160.

The previous prime is 79101809. The next prime is 79101829. The reversal of 79101821 is 12810197.

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

It is a cyclic number.

It is not a de Polignac number, because 79101821 - 2¹⁴ = 79085437 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79101829) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19586 + ... + 23276.

It is an arithmetic number, because the mean of its divisors is an integer number (10245300).

Almost surely, 2^79101821 is an apocalyptic number.

It is an amenable number.

79101821 is a deficient number, since it is larger than the sum of its proper divisors (2860579).

79101821 is a wasteful number, since it uses less digits than its factorization.

79101821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4459.

The product of its (nonzero) digits is 1008, while the sum is 29.

The square root of 79101821 is about 8893.9204516344. The cubic root of 79101821 is about 429.2683085657.

The spelling of 79101821 in words is "seventy-nine million, one hundred one thousand, eight hundred twenty-one".