99950021 has 4 divisors (see below), whose sum is σ = 105829452. Its totient is φ = 94070592.

The previous prime is 99950009. The next prime is 99950023. The reversal of 99950021 is 12005999.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12005999 = 3323 ⋅3613.

It can be written as a sum of positive squares in 2 ways, for example, as 62188996 + 37761025 = 7886^2 + 6145^2 .

It is a cyclic number.

It is not a de Polignac number, because 99950021 - 2¹⁰ = 99948997 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 (99950023) 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, 2939690 + ... + 2939723.

It is an arithmetic number, because the mean of its divisors is an integer number (26457363).

Almost surely, 2^99950021 is an apocalyptic number.

It is an amenable number.

99950021 is a deficient number, since it is larger than the sum of its proper divisors (5879431).

99950021 is a wasteful number, since it uses less digits than its factorization.

99950021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5879430.

The product of its (nonzero) digits is 7290, while the sum is 35.

The square root of 99950021 is about 9997.5007376844. The cubic root of 99950021 is about 464.0815431525.

The spelling of 99950021 in words is "ninety-nine million, nine hundred fifty thousand, twenty-one".