21200764 has 12 divisors (see below), whose sum is σ = 39955384. Its totient is φ = 9784944.

The previous prime is 21200761. The next prime is 21200771. The reversal of 21200764 is 46700212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21200761) 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, 203802 + ... + 203905.

Almost surely, 2^21200764 is an apocalyptic number.

It is an amenable number.

21200764 is a deficient number, since it is larger than the sum of its proper divisors (18754620).

21200764 is a wasteful number, since it uses less digits than its factorization.

21200764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407724 (or 407722 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 21200764 is about 4604.4287376394. The cubic root of 21200764 is about 276.7688253563.

Adding to 21200764 its reverse (46700212), we get a palindrome (67900976).

The spelling of 21200764 in words is "twenty-one million, two hundred thousand, seven hundred sixty-four".