21652272 has 60 divisors (see below), whose sum is σ = 62851880. Its totient is φ = 7216128.

The previous prime is 21652219. The next prime is 21652273. The reversal of 21652272 is 27225612.

21652272 is a `hidden beast` number, since 2 + 1 + 652 + 2 + 7 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (21652273) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1104 + ... + 6672.

Almost surely, 2^21652272 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21652272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31425940).

21652272 is an abundant number, since it is smaller than the sum of its proper divisors (41199608).

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

21652272 is an equidigital number, since it uses as much as digits as its factorization.

21652272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5592 (or 5574 counting only the distinct ones).

The product of its digits is 3360, while the sum is 27.

The square root of 21652272 is about 4653.2001891172. The cubic root of 21652272 is about 278.7198019396.

Adding to 21652272 its reverse (27225612), we get a palindrome (48877884).

The spelling of 21652272 in words is "twenty-one million, six hundred fifty-two thousand, two hundred seventy-two".