200021231 has 4 divisors (see below), whose sum is σ = 200782032. Its totient is φ = 199260432.

The previous prime is 200021219. The next prime is 200021243. The reversal of 200021231 is 132120002.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (200021219) and next prime (200021243).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-200021231 is a prime.

It is a super-2 number, since 2×200021231² = 80016985701510722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (200021281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 380006 + ... + 380531.

It is an arithmetic number, because the mean of its divisors is an integer number (50195508).

Almost surely, 2^200021231 is an apocalyptic number.

200021231 is a deficient number, since it is larger than the sum of its proper divisors (760801).

200021231 is an equidigital number, since it uses as much as digits as its factorization.

200021231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 760800.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 200021231 is about 14142.8862330148. The cubic root of 200021231 is about 584.8242401839.

Adding to 200021231 its reverse (132120002), we get a palindrome (332141233).

The spelling of 200021231 in words is "two hundred million, twenty-one thousand, two hundred thirty-one".