21325444 has 12 divisors (see below), whose sum is σ = 42650944. Its totient is φ = 9139464.

The previous prime is 21325441. The next prime is 21325457. The reversal of 21325444 is 44452312.

It is a happy number.

21325444 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (21325441) 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, 380784 + ... + 380839.

Almost surely, 2^21325444 is an apocalyptic number.

It is an amenable number.

21325444 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21325444 is a wasteful number, since it uses less digits than its factorization.

21325444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 761634 (or 761632 counting only the distinct ones).

The product of its digits is 3840, while the sum is 25.

The square root of 21325444 is about 4617.9480291575. The cubic root of 21325444 is about 277.3103170361.

Adding to 21325444 its reverse (44452312), we get a palindrome (65777756).

The spelling of 21325444 in words is "twenty-one million, three hundred twenty-five thousand, four hundred forty-four".