99121903 has 4 divisors (see below), whose sum is σ = 99141840. Its totient is φ = 99101968.

The previous prime is 99121901. The next prime is 99121909. The reversal of 99121903 is 30912199.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30912199 = 541 ⋅57139.

It is a cyclic number.

It is not a de Polignac number, because 99121903 - 2¹ = 99121901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99121901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4251 + ... + 14707.

It is an arithmetic number, because the mean of its divisors is an integer number (24785460).

Almost surely, 2^99121903 is an apocalyptic number.

99121903 is a deficient number, since it is larger than the sum of its proper divisors (19937).

99121903 is a wasteful number, since it uses less digits than its factorization.

99121903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19936.

The product of its (nonzero) digits is 4374, while the sum is 34.

The square root of 99121903 is about 9955.9983427078. The cubic root of 99121903 is about 462.7962988633.

The spelling of 99121903 in words is "ninety-nine million, one hundred twenty-one thousand, nine hundred three".