79101921 has 16 divisors (see below), whose sum is σ = 112011840. Its totient is φ = 49512960.

The previous prime is 79101907. The next prime is 79101923. The reversal of 79101921 is 12910197.

It is not a de Polignac number, because 79101921 - 2¹¹ = 79099873 is a prime.

It is a super-2 number, since 2×79101921² = 12514227811780482, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (79101923) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 301 + ... + 12581.

It is an arithmetic number, because the mean of its divisors is an integer number (7000740).

Almost surely, 2^79101921 is an apocalyptic number.

It is an amenable number.

79101921 is a deficient number, since it is larger than the sum of its proper divisors (32909919).

79101921 is a wasteful number, since it uses less digits than its factorization.

79101921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12416.

The product of its (nonzero) digits is 1134, while the sum is 30.

The square root of 79101921 is about 8893.9260734504. The cubic root of 79101921 is about 429.2684894583.

The spelling of 79101921 in words is "seventy-nine million, one hundred one thousand, nine hundred twenty-one".