21335452 has 12 divisors (see below), whose sum is σ = 37388176. Its totient is φ = 10653120.

The previous prime is 21335449. The next prime is 21335453. The reversal of 21335452 is 25453312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21335453) 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, 52 + ... + 6532.

Almost surely, 2^21335452 is an apocalyptic number.

It is an amenable number.

21335452 is a deficient number, since it is larger than the sum of its proper divisors (16052724).

21335452 is a wasteful number, since it uses less digits than its factorization.

21335452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7308 (or 7306 counting only the distinct ones).

The product of its digits is 3600, while the sum is 25.

The square root of 21335452 is about 4619.0315002173. The cubic root of 21335452 is about 277.3536906952.

Adding to 21335452 its reverse (25453312), we get a palindrome (46788764).

The spelling of 21335452 in words is "twenty-one million, three hundred thirty-five thousand, four hundred fifty-two".