21225232 has 30 divisors (see below), whose sum is σ = 47839758. Its totient is φ = 9096192.

The previous prime is 21225229. The next prime is 21225233. The reversal of 21225232 is 23252212.

It can be written as a sum of positive squares in only one way, i.e., 18113536 + 3111696 = 4256^2 + 1764^2 .

It is not an unprimeable number, because it can be changed into a prime (21225233) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12753 + ... + 14320.

Almost surely, 2^21225232 is an apocalyptic number.

It is an amenable number.

21225232 is an abundant number, since it is smaller than the sum of its proper divisors (26614526).

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

21225232 is a wasteful number, since it uses less digits than its factorization.

21225232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27095 (or 27082 counting only the distinct ones).

The product of its digits is 480, while the sum is 19.

The square root of 21225232 is about 4607.0849785955. The cubic root of 21225232 is about 276.8752582516.

Adding to 21225232 its reverse (23252212), we get a palindrome (44477444).

The spelling of 21225232 in words is "twenty-one million, two hundred twenty-five thousand, two hundred thirty-two".