200021901 has 4 divisors (see below), whose sum is σ = 266695872. Its totient is φ = 133347932.

The previous prime is 200021897. The next prime is 200021909. The reversal of 200021901 is 109120002.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 200021901 - 2² = 200021897 is a prime.

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 polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33336981 + ... + 33336986.

It is an arithmetic number, because the mean of its divisors is an integer number (66673968).

Almost surely, 2^200021901 is an apocalyptic number.

It is an amenable number.

200021901 is a deficient number, since it is larger than the sum of its proper divisors (66673971).

200021901 is an equidigital number, since it uses as much as digits as its factorization.

200021901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66673970.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 200021901 is about 14142.9099198149. The cubic root of 200021901 is about 584.8248931676.

Adding to 200021901 its reverse (109120002), we get a palindrome (309141903).

The spelling of 200021901 in words is "two hundred million, twenty-one thousand, nine hundred one".