99099621 has 6 divisors (see below), whose sum is σ = 143143910. Its totient is φ = 66066408.

The previous prime is 99099587. The next prime is 99099629. The reversal of 99099621 is 12699099.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 94303521 + 4796100 = 9711^2 + 2190^2 .

It is not a de Polignac number, because 99099621 - 2⁶ = 99099557 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 (99099629) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5505526 + ... + 5505543.

Almost surely, 2^99099621 is an apocalyptic number.

It is an amenable number.

99099621 is a deficient number, since it is larger than the sum of its proper divisors (44044289).

99099621 is a wasteful number, since it uses less digits than its factorization.

99099621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11011075 (or 11011072 counting only the distinct ones).

The product of its (nonzero) digits is 78732, while the sum is 45.

The square root of 99099621 is about 9954.8792559227. The cubic root of 99099621 is about 462.7616183349.

The spelling of 99099621 in words is "ninety-nine million, ninety-nine thousand, six hundred twenty-one".