21200431 has 8 divisors (see below), whose sum is σ = 24744960. Its totient is φ = 17784888.

The previous prime is 21200401. The next prime is 21200461. The reversal of 21200431 is 13400212.

It is an interprime number because it is at equal distance from previous prime (21200401) and next prime (21200461).

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 21200431 - 2⁷ = 21200303 is a prime.

It is a super-2 number, since 2×21200431² = 898916549171522, 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 (21200401) 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, 31891 + ... + 32548.

It is an arithmetic number, because the mean of its divisors is an integer number (3093120).

Almost surely, 2^21200431 is an apocalyptic number.

21200431 is a deficient number, since it is larger than the sum of its proper divisors (3544529).

21200431 is an equidigital number, since it uses as much as digits as its factorization.

21200431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64493.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 21200431 is about 4604.3925766598. The cubic root of 21200431 is about 276.7673762811.

Adding to 21200431 its reverse (13400212), we get a palindrome (34600643).

The spelling of 21200431 in words is "twenty-one million, two hundred thousand, four hundred thirty-one".