99020200021 has 4 divisors (see below), whose sum is σ = 99148299372. Its totient is φ = 98892100672.

The previous prime is 99020200009. The next prime is 99020200099. The reversal of 99020200021 is 12000202099.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 42512254225 + 56507945796 = 206185^2 + 237714^2 .

It is a cyclic number.

It is not a de Polignac number, because 99020200021 - 2²³ = 99011811413 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 (99020200621) 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, 64048516 + ... + 64050061.

It is an arithmetic number, because the mean of its divisors is an integer number (24787074843).

Almost surely, 2^99020200021 is an apocalyptic number.

It is an amenable number.

99020200021 is a deficient number, since it is larger than the sum of its proper divisors (128099351).

99020200021 is a wasteful number, since it uses less digits than its factorization.

99020200021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128099350.

The product of its (nonzero) digits is 648, while the sum is 25.

The spelling of 99020200021 in words is "ninety-nine billion, twenty million, two hundred thousand, twenty-one".