200921 has 4 divisors (see below), whose sum is σ = 229632. Its totient is φ = 172212.

The previous prime is 200909. The next prime is 200927. The reversal of 200921 is 129002.

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 a de Polignac number, because none of the positive numbers 2^k-200921 is a prime.

It is a super-3 number, since 3×200921³ = 24333089177489883, which contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 200896 and 200905.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 200921.

It is not an unprimeable number, because it can be changed into a prime (200927) 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, 14345 + ... + 14358.

It is an arithmetic number, because the mean of its divisors is an integer number (57408).

2²⁰⁰⁹²¹ is an apocalyptic number.

It is an amenable number.

200921 is a deficient number, since it is larger than the sum of its proper divisors (28711).

200921 is an equidigital number, since it uses as much as digits as its factorization.

200921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28710.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 200921 is about 448.2421220724. The cubic root of 200921 is about 58.5699846674.

Adding to 200921 its reverse (129002), we get a palindrome (329923).

The spelling of 200921 in words is "two hundred thousand, nine hundred twenty-one".