99919121 has 8 divisors (see below), whose sum is σ = 101498880. Its totient is φ = 98347392.

The previous prime is 99919117. The next prime is 99919139. The reversal of 99919121 is 12191999.

It is a happy number.

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 99919121 - 2² = 99919117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99919111) 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 7 ways as a sum of consecutive naturals, for example, 26096 + ... + 29678.

It is an arithmetic number, because the mean of its divisors is an integer number (12687360).

Almost surely, 2^99919121 is an apocalyptic number.

It is an amenable number.

99919121 is a deficient number, since it is larger than the sum of its proper divisors (1579759).

99919121 is a wasteful number, since it uses less digits than its factorization.

99919121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4015.

The product of its digits is 13122, while the sum is 41.

The square root of 99919121 is about 9995.9552319926. The cubic root of 99919121 is about 464.0337139222.

The spelling of 99919121 in words is "ninety-nine million, nine hundred nineteen thousand, one hundred twenty-one".