99632421 has 36 divisors (see below), whose sum is σ = 167932128. Its totient is φ = 55759392.

The previous prime is 99632411. The next prime is 99632473. The reversal of 99632421 is 12423699.

It is not a de Polignac number, because 99632421 - 2²² = 95438117 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99632411) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 176686 + ... + 177248.

Almost surely, 2^99632421 is an apocalyptic number.

It is an amenable number.

99632421 is a deficient number, since it is larger than the sum of its proper divisors (68299707).

99632421 is a wasteful number, since it uses less digits than its factorization.

99632421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 682 (or 626 counting only the distinct ones).

The product of its digits is 23328, while the sum is 36.

The square root of 99632421 is about 9981.6041295976. The cubic root of 99632421 is about 463.5894682462.

The spelling of 99632421 in words is "ninety-nine million, six hundred thirty-two thousand, four hundred twenty-one".