99963753021 has 32 divisors (see below), whose sum is σ = 170060620800. Its totient is φ = 57395453040.

The previous prime is 99963753011. The next prime is 99963753067. The reversal of 99963753021 is 12035736999.

It is a happy number.

It is not a de Polignac number, because 99963753021 - 2⁹ = 99963752509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99963753011) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8851681 + ... + 8862966.

It is an arithmetic number, because the mean of its divisors is an integer number (5314394400).

Almost surely, 2^99963753021 is an apocalyptic number.

It is an amenable number.

99963753021 is a deficient number, since it is larger than the sum of its proper divisors (70096867779).

99963753021 is a wasteful number, since it uses less digits than its factorization.

99963753021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17714686 (or 17714680 counting only the distinct ones).

The product of its (nonzero) digits is 2755620, while the sum is 54.

The spelling of 99963753021 in words is "ninety-nine billion, nine hundred sixty-three million, seven hundred fifty-three thousand, twenty-one".