21200231 has 8 divisors (see below), whose sum is σ = 23045904. Its totient is φ = 19385280.

The previous prime is 21200209. The next prime is 21200233. The reversal of 21200231 is 13200212.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21200231 - 2¹⁰ = 21199207 is a prime.

It is a super-2 number, since 2×21200231² = 898899588906722, 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 (21200233) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6230 + ... + 9011.

It is an arithmetic number, because the mean of its divisors is an integer number (2880738).

Almost surely, 2^21200231 is an apocalyptic number.

21200231 is a deficient number, since it is larger than the sum of its proper divisors (1845673).

21200231 is a wasteful number, since it uses less digits than its factorization.

21200231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15361.

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

The square root of 21200231 is about 4604.3708582172. The cubic root of 21200231 is about 276.7665059584.

Adding to 21200231 its reverse (13200212), we get a palindrome (34400443).

The spelling of 21200231 in words is "twenty-one million, two hundred thousand, two hundred thirty-one".