21344272 has 20 divisors (see below), whose sum is σ = 42364476. Its totient is φ = 10411520.

The previous prime is 21344249. The next prime is 21344273. The reversal of 21344272 is 27244312.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 404496 + 20939776 = 636^2 + 4576^2 .

It is not an unprimeable number, because it can be changed into a prime (21344273) 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, 15613 + ... + 16924.

Almost surely, 2^21344272 is an apocalyptic number.

It is an amenable number.

21344272 is a deficient number, since it is larger than the sum of its proper divisors (21020204).

21344272 is a wasteful number, since it uses less digits than its factorization.

21344272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32586 (or 32580 counting only the distinct ones).

The product of its digits is 2688, while the sum is 25.

The square root of 21344272 is about 4619.9861471654. The cubic root of 21344272 is about 277.3919044398.

Adding to 21344272 its reverse (27244312), we get a palindrome (48588584).

The spelling of 21344272 in words is "twenty-one million, three hundred forty-four thousand, two hundred seventy-two".