21144324 has 24 divisors (see below), whose sum is σ = 49412608. Its totient is φ = 7037280.

The previous prime is 21144323. The next prime is 21144341. The reversal of 21144324 is 42344112.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 21144324.

It is not an unprimeable number, because it can be changed into a prime (21144323) 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, 12234 + ... + 13854.

Almost surely, 2^21144324 is an apocalyptic number.

It is an amenable number.

21144324 is an abundant number, since it is smaller than the sum of its proper divisors (28268284).

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

21144324 is a wasteful number, since it uses less digits than its factorization.

21144324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2715 (or 2713 counting only the distinct ones).

The product of its digits is 768, while the sum is 21.

The square root of 21144324 is about 4598.2957712613. The cubic root of 21144324 is about 276.5230053660.

Adding to 21144324 its reverse (42344112), we get a palindrome (63488436).

The spelling of 21144324 in words is "twenty-one million, one hundred forty-four thousand, three hundred twenty-four".