21600272 has 10 divisors (see below), whose sum is σ = 41850558. Its totient is φ = 10800128.

The previous prime is 21600269. The next prime is 21600277. The reversal of 21600272 is 27200612.

It can be written as a sum of positive squares in only one way, i.e., 14714896 + 6885376 = 3836^2 + 2624^2 .

It is not an unprimeable number, because it can be changed into a prime (21600277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 674993 + ... + 675024.

Almost surely, 2^21600272 is an apocalyptic number.

It is an amenable number.

21600272 is a deficient number, since it is larger than the sum of its proper divisors (20250286).

21600272 is a wasteful number, since it uses less digits than its factorization.

21600272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1350025 (or 1350019 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 21600272 is about 4647.6092778976. The cubic root of 21600272 is about 278.4964990046.

Adding to 21600272 its reverse (27200612), we get a palindrome (48800884).

The spelling of 21600272 in words is "twenty-one million, six hundred thousand, two hundred seventy-two".