99455921 has 4 divisors (see below), whose sum is σ = 99487344. Its totient is φ = 99424500.

The previous prime is 99455911. The next prime is 99455927. The reversal of 99455921 is 12955499.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12955499 = 233 ⋅55603.

It is a cyclic number.

It is not a de Polignac number, because 99455921 - 2¹⁰ = 99454897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99455927) 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, 10355 + ... + 17496.

It is an arithmetic number, because the mean of its divisors is an integer number (24871836).

Almost surely, 2^99455921 is an apocalyptic number.

It is an amenable number.

99455921 is a deficient number, since it is larger than the sum of its proper divisors (31423).

99455921 is a wasteful number, since it uses less digits than its factorization.

99455921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31422.

The product of its digits is 145800, while the sum is 44.

The square root of 99455921 is about 9972.7589462495. The cubic root of 99455921 is about 463.3155550459.

The spelling of 99455921 in words is "ninety-nine million, four hundred fifty-five thousand, nine hundred twenty-one".