21465344 has 36 divisors (see below), whose sum is σ = 43169280. Its totient is φ = 10652160.

The previous prime is 21465331. The next prime is 21465349. The reversal of 21465344 is 44356412.

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (21465349) 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, 48677 + ... + 49115.

Almost surely, 2^21465344 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21465344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21584640).

21465344 is an abundant number, since it is smaller than the sum of its proper divisors (21703936).

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

21465344 is an equidigital number, since it uses as much as digits as its factorization.

21465344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 646 (or 632 counting only the distinct ones).

The product of its digits is 11520, while the sum is 29.

The square root of 21465344 is about 4633.0706879995. The cubic root of 21465344 is about 277.9154030673.

The spelling of 21465344 in words is "twenty-one million, four hundred sixty-five thousand, three hundred forty-four".