99121894 has 4 divisors (see below), whose sum is σ = 148682844. Its totient is φ = 49560946.

The previous prime is 99121871. The next prime is 99121901. The reversal of 99121894 is 49812199.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 49812199 = 227 ⋅219437.

It is a self number, because there is not a number n which added to its sum of digits gives 99121894.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24780472 + ... + 24780475.

It is an arithmetic number, because the mean of its divisors is an integer number (37170711).

Almost surely, 2^99121894 is an apocalyptic number.

99121894 is a deficient number, since it is larger than the sum of its proper divisors (49560950).

99121894 is a wasteful number, since it uses less digits than its factorization.

99121894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49560949.

The product of its digits is 46656, while the sum is 43.

The square root of 99121894 is about 9955.9978907189. The cubic root of 99121894 is about 462.7962848564.

The spelling of 99121894 in words is "ninety-nine million, one hundred twenty-one thousand, eight hundred ninety-four".