99763921 has 4 divisors (see below), whose sum is σ = 102982144. Its totient is φ = 96545700.

The previous prime is 99763907. The next prime is 99763931. The reversal of 99763921 is 12936799.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12936799 = 2459 ⋅5261.

It is a cyclic number.

It is not a de Polignac number, because 99763921 - 2⁹ = 99763409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99763931) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1609065 + ... + 1609126.

It is an arithmetic number, because the mean of its divisors is an integer number (25745536).

Almost surely, 2^99763921 is an apocalyptic number.

It is an amenable number.

99763921 is a deficient number, since it is larger than the sum of its proper divisors (3218223).

99763921 is a wasteful number, since it uses less digits than its factorization.

99763921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3218222.

The product of its digits is 183708, while the sum is 46.

The square root of 99763921 is about 9988.1890751027. The cubic root of 99763921 is about 463.7933349991.

The spelling of 99763921 in words is "ninety-nine million, seven hundred sixty-three thousand, nine hundred twenty-one".