99037021 has 4 divisors (see below), whose sum is σ = 99106912. Its totient is φ = 98967132.

The previous prime is 99036991. The next prime is 99037031. The reversal of 99037021 is 12073099.

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: 12073099 = 2141 ⋅5639.

It is a cyclic number.

It is not a de Polignac number, because 99037021 - 2⁵ = 99036989 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 (99037031) 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, 32775 + ... + 35668.

It is an arithmetic number, because the mean of its divisors is an integer number (24776728).

Almost surely, 2^99037021 is an apocalyptic number.

It is an amenable number.

99037021 is a deficient number, since it is larger than the sum of its proper divisors (69891).

99037021 is a wasteful number, since it uses less digits than its factorization.

99037021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69890.

The product of its (nonzero) digits is 3402, while the sum is 31.

The square root of 99037021 is about 9951.7345724251. The cubic root of 99037021 is about 462.6641575544.

The spelling of 99037021 in words is "ninety-nine million, thirty-seven thousand, twenty-one".