99121893 has 16 divisors (see below), whose sum is σ = 144337536. Its totient is φ = 60137280.

The previous prime is 99121871. The next prime is 99121901. The reversal of 99121893 is 39812199.

It is not a de Polignac number, because 99121893 - 2⁵ = 99121861 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99121823) 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, 15130 + ... + 20667.

It is an arithmetic number, because the mean of its divisors is an integer number (9021096).

Almost surely, 2^99121893 is an apocalyptic number.

It is an amenable number.

99121893 is a deficient number, since it is larger than the sum of its proper divisors (45215643).

99121893 is a wasteful number, since it uses less digits than its factorization.

99121893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35884.

The product of its digits is 34992, while the sum is 42.

The square root of 99121893 is about 9955.9978404980. The cubic root of 99121893 is about 462.7962833001.

The spelling of 99121893 in words is "ninety-nine million, one hundred twenty-one thousand, eight hundred ninety-three".