99965021 has 6 divisors (see below), whose sum is σ = 108246330. Its totient is φ = 92275248.

The previous prime is 99964993. The next prime is 99965027. The reversal of 99965021 is 12056999.

It can be written as a sum of positive squares in 3 ways, for example, as 184900 + 99780121 = 430^2 + 9989^2 .

It is not a de Polignac number, because 99965021 - 2⁶ = 99964957 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 99965021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99965027) 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, 295586 + ... + 295923.

It is an arithmetic number, because the mean of its divisors is an integer number (18041055).

Almost surely, 2^99965021 is an apocalyptic number.

It is an amenable number.

99965021 is a deficient number, since it is larger than the sum of its proper divisors (8281309).

99965021 is a wasteful number, since it uses less digits than its factorization.

99965021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 591535 (or 591522 counting only the distinct ones).

The product of its (nonzero) digits is 43740, while the sum is 41.

The square root of 99965021 is about 9998.2508970319. The cubic root of 99965021 is about 464.1047576713.

The spelling of 99965021 in words is "ninety-nine million, nine hundred sixty-five thousand, twenty-one".