200021999 has 4 divisors (see below), whose sum is σ = 201346800. Its totient is φ = 198697200.

The previous prime is 200021953. The next prime is 200022029. The reversal of 200021999 is 999120002.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 999120002 = 2 ⋅499560001.

It is a cyclic number.

It is not a de Polignac number, because 200021999 - 2²⁴ = 183244783 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 (200021909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 662174 + ... + 662475.

It is an arithmetic number, because the mean of its divisors is an integer number (50336700).

Almost surely, 2^200021999 is an apocalyptic number.

200021999 is a deficient number, since it is larger than the sum of its proper divisors (1324801).

200021999 is a wasteful number, since it uses less digits than its factorization.

200021999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1324800.

The product of its (nonzero) digits is 2916, while the sum is 32.

The square root of 200021999 is about 14142.9133844481. The cubic root of 200021999 is about 584.8249886785.

The spelling of 200021999 in words is "two hundred million, twenty-one thousand, nine hundred ninety-nine".