21200464 has 20 divisors (see below), whose sum is σ = 41247360. Its totient is φ = 10556000.

The previous prime is 21200461. The next prime is 21200467. The reversal of 21200464 is 46400212.

It is an interprime number because it is at equal distance from previous prime (21200461) and next prime (21200467).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21200461) 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, 1377 + ... + 6655.

It is an arithmetic number, because the mean of its divisors is an integer number (2062368).

Almost surely, 2^21200464 is an apocalyptic number.

It is an amenable number.

21200464 is a deficient number, since it is larger than the sum of its proper divisors (20046896).

21200464 is a wasteful number, since it uses less digits than its factorization.

21200464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5538 (or 5532 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 21200464 is about 4604.3961601930. The cubic root of 21200464 is about 276.7675198839.

Adding to 21200464 its reverse (46400212), we get a palindrome (67600676).

The spelling of 21200464 in words is "twenty-one million, two hundred thousand, four hundred sixty-four".