21200534 has 8 divisors (see below), whose sum is σ = 31859568. Its totient is φ = 10580680.

The previous prime is 21200533. The next prime is 21200539. The reversal of 21200534 is 43500212.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21200533) 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, 8402 + ... + 10629.

It is an arithmetic number, because the mean of its divisors is an integer number (3982446).

Almost surely, 2^21200534 is an apocalyptic number.

21200534 is a deficient number, since it is larger than the sum of its proper divisors (10659034).

21200534 is a wasteful number, since it uses less digits than its factorization.

21200534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19590.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 21200534 is about 4604.4037616178. The cubic root of 21200534 is about 276.7678244952.

Adding to 21200534 its reverse (43500212), we get a palindrome (64700746).

The spelling of 21200534 in words is "twenty-one million, two hundred thousand, five hundred thirty-four".