79821105 has 32 divisors (see below), whose sum is σ = 157188864. Its totient is φ = 33682176.

The previous prime is 79821101. The next prime is 79821113. The reversal of 79821105 is 50112897.

It is not a de Polignac number, because 79821105 - 2² = 79821101 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (79821101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 27874 + ... + 30603.

It is an arithmetic number, because the mean of its divisors is an integer number (4912152).

Almost surely, 2^79821105 is an apocalyptic number.

It is an amenable number.

79821105 is a deficient number, since it is larger than the sum of its proper divisors (77367759).

79821105 is a wasteful number, since it uses less digits than its factorization.

79821105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58505.

The product of its (nonzero) digits is 5040, while the sum is 33.

The square root of 79821105 is about 8934.2657784510. The cubic root of 79821105 is about 430.5655169731.

The spelling of 79821105 in words is "seventy-nine million, eight hundred twenty-one thousand, one hundred five".