99656121 has 16 divisors (see below), whose sum is σ = 142848000. Its totient is φ = 61599888.

The previous prime is 99656111. The next prime is 99656149. The reversal of 99656121 is 12165699.

It is not a de Polignac number, because 99656121 - 2¹¹ = 99654073 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 99656121.

It is not an unprimeable number, because it can be changed into a prime (99656111) 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, 15921 + ... + 21278.

It is an arithmetic number, because the mean of its divisors is an integer number (8928000).

Almost surely, 2^99656121 is an apocalyptic number.

It is an amenable number.

99656121 is a deficient number, since it is larger than the sum of its proper divisors (43191879).

99656121 is a wasteful number, since it uses less digits than its factorization.

99656121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37268.

The product of its digits is 29160, while the sum is 39.

The square root of 99656121 is about 9982.7912429340. The cubic root of 99656121 is about 463.6262240172.

The spelling of 99656121 in words is "ninety-nine million, six hundred fifty-six thousand, one hundred twenty-one".