99228821 has 8 divisors (see below), whose sum is σ = 102131040. Its totient is φ = 96353712.

The previous prime is 99228781. The next prime is 99228823. The reversal of 99228821 is 12882299.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 99228821 - 2⁶ = 99228757 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 (99228823) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 770 + ... + 14108.

It is an arithmetic number, because the mean of its divisors is an integer number (12766380).

Almost surely, 2^99228821 is an apocalyptic number.

It is an amenable number.

99228821 is a deficient number, since it is larger than the sum of its proper divisors (2902219).

99228821 is a wasteful number, since it uses less digits than its factorization.

99228821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13555.

The product of its digits is 41472, while the sum is 41.

The square root of 99228821 is about 9961.3664223338. The cubic root of 99228821 is about 462.9626377276.

The spelling of 99228821 in words is "ninety-nine million, two hundred twenty-eight thousand, eight hundred twenty-one".