21334272 has 36 divisors (see below), whose sum is σ = 56782320. Its totient is φ = 7111168.

The previous prime is 21334253. The next prime is 21334319. The reversal of 21334272 is 27243312.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13122 + ... + 14657.

Almost surely, 2^21334272 is an apocalyptic number.

It is an amenable number.

21334272 is an abundant number, since it is smaller than the sum of its proper divisors (35448048).

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

21334272 is an equidigital number, since it uses as much as digits as its factorization.

21334272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27798 (or 27784 counting only the distinct ones).

The product of its digits is 2016, while the sum is 24.

The square root of 21334272 is about 4618.9037660467. The cubic root of 21334272 is about 277.3485774001.

Adding to 21334272 its reverse (27243312), we get a palindrome (48577584).

The spelling of 21334272 in words is "twenty-one million, three hundred thirty-four thousand, two hundred seventy-two".