21331452 has 24 divisors (see below), whose sum is σ = 52393600. Its totient is φ = 6736176.

The previous prime is 21331451. The next prime is 21331459. The reversal of 21331452 is 25413312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21331451) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46552 + ... + 47007.

Almost surely, 2^21331452 is an apocalyptic number.

It is an amenable number.

21331452 is an abundant number, since it is smaller than the sum of its proper divisors (31062148).

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

21331452 is a wasteful number, since it uses less digits than its factorization.

21331452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93585 (or 93583 counting only the distinct ones).

The product of its digits is 720, while the sum is 21.

The square root of 21331452 is about 4618.5984887193. The cubic root of 21331452 is about 277.3363567276.

Adding to 21331452 its reverse (25413312), we get a palindrome (46744764).

The spelling of 21331452 in words is "twenty-one million, three hundred thirty-one thousand, four hundred fifty-two".