21459396 has 24 divisors (see below), whose sum is σ = 57225280. Its totient is φ = 6131232.

The previous prime is 21459377. The next prime is 21459419. The reversal of 21459396 is 69395412.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 127651 + ... + 127818.

Almost surely, 2^21459396 is an apocalyptic number.

It is an amenable number.

21459396 is an abundant number, since it is smaller than the sum of its proper divisors (35765884).

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

21459396 is a wasteful number, since it uses less digits than its factorization.

21459396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255483 (or 255481 counting only the distinct ones).

The product of its digits is 58320, while the sum is 39.

The square root of 21459396 is about 4632.4287366348. The cubic root of 21459396 is about 277.8897307786.

The spelling of 21459396 in words is "twenty-one million, four hundred fifty-nine thousand, three hundred ninety-six".