99863621 has 12 divisors (see below), whose sum is σ = 117969120. Its totient is φ = 83800080.

The previous prime is 99863609. The next prime is 99863623. The reversal of 99863621 is 12636899.

It is not a de Polignac number, because 99863621 - 2¹⁰ = 99862597 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99863623) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25001 + ... + 28718.

It is an arithmetic number, because the mean of its divisors is an integer number (9830760).

Almost surely, 2^99863621 is an apocalyptic number.

It is an amenable number.

99863621 is a deficient number, since it is larger than the sum of its proper divisors (18105499).

99863621 is a wasteful number, since it uses less digits than its factorization.

99863621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53756 (or 53743 counting only the distinct ones).

The product of its digits is 139968, while the sum is 44.

The square root of 99863621 is about 9993.1787235094. The cubic root of 99863621 is about 463.9477822851.

The spelling of 99863621 in words is "ninety-nine million, eight hundred sixty-three thousand, six hundred twenty-one".