21200264 has 8 divisors (see below), whose sum is σ = 39750510. Its totient is φ = 10600128.

The previous prime is 21200233. The next prime is 21200279. The reversal of 21200264 is 46200212.

It can be written as a sum of positive squares in only one way, i.e., 13032100 + 8168164 = 3610^2 + 2858^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1325009 + ... + 1325024.

Almost surely, 2^21200264 is an apocalyptic number.

It is an amenable number.

21200264 is a deficient number, since it is larger than the sum of its proper divisors (18550246).

21200264 is a wasteful number, since it uses less digits than its factorization.

21200264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2650039 (or 2650035 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 21200264 is about 4604.3744417673. The cubic root of 21200264 is about 276.7666495621.

Adding to 21200264 its reverse (46200212), we get a palindrome (67400476).

The spelling of 21200264 in words is "twenty-one million, two hundred thousand, two hundred sixty-four".