99658821 has 16 divisors (see below), whose sum is σ = 137332800. Its totient is φ = 64243200.

The previous prime is 99658817. The next prime is 99658829. The reversal of 99658821 is 12885699.

It is a happy number.

It is not a de Polignac number, because 99658821 - 2² = 99658817 is a prime.

It is a super-2 number, since 2×99658821² = 19863761206220082, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99658829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9205 + ... + 16853.

It is an arithmetic number, because the mean of its divisors is an integer number (8583300).

Almost surely, 2^99658821 is an apocalyptic number.

It is an amenable number.

99658821 is a deficient number, since it is larger than the sum of its proper divisors (37673979).

99658821 is a wasteful number, since it uses less digits than its factorization.

99658821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7796.

The product of its digits is 311040, while the sum is 48.

The square root of 99658821 is about 9982.9264747368. The cubic root of 99658821 is about 463.6304110137.

The spelling of 99658821 in words is "ninety-nine million, six hundred fifty-eight thousand, eight hundred twenty-one".