99102021 has 16 divisors (see below), whose sum is σ = 136252800. Its totient is φ = 64024128.

The previous prime is 99102007. The next prime is 99102041. The reversal of 99102021 is 12020199.

It is not a de Polignac number, because 99102021 - 2¹⁵ = 99069253 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 99101982 and 99102000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99102001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28200 + ... + 31518.

It is an arithmetic number, because the mean of its divisors is an integer number (8515800).

Almost surely, 2^99102021 is an apocalyptic number.

It is an amenable number.

99102021 is a deficient number, since it is larger than the sum of its proper divisors (37150779).

99102021 is a wasteful number, since it uses less digits than its factorization.

99102021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3628.

The product of its (nonzero) digits is 324, while the sum is 24.

The square root of 99102021 is about 9954.9997990959. Note that the first 3 decimals coincide. The cubic root of 99102021 is about 462.7653540334.

The spelling of 99102021 in words is "ninety-nine million, one hundred two thousand, twenty-one".