21230264 has 16 divisors (see below), whose sum is σ = 43425720. Its totient is φ = 9650080.

The previous prime is 21230249. The next prime is 21230273. The reversal of 21230264 is 46203212.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 120539 + ... + 120714.

Almost surely, 2^21230264 is an apocalyptic number.

It is an amenable number.

21230264 is an abundant number, since it is smaller than the sum of its proper divisors (22195456).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21230264 is a wasteful number, since it uses less digits than its factorization.

21230264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241270 (or 241266 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 21230264 is about 4607.6310616194. The cubic root of 21230264 is about 276.8971367123.

Adding to 21230264 its reverse (46203212), we get a palindrome (67433476).

The spelling of 21230264 in words is "twenty-one million, two hundred thirty thousand, two hundred sixty-four".