21693344 has 24 divisors (see below), whose sum is σ = 42981120. Its totient is φ = 10777536.

The previous prime is 21693341. The next prime is 21693361. The reversal of 21693344 is 44339612.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a self number, because there is not a number n which added to its sum of digits gives 21693344.

It is not an unprimeable number, because it can be changed into a prime (21693341) 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, 3137 + ... + 7295.

It is an arithmetic number, because the mean of its divisors is an integer number (1790880).

Almost surely, 2^21693344 is an apocalyptic number.

It is an amenable number.

21693344 is a deficient number, since it is larger than the sum of its proper divisors (21287776).

21693344 is a wasteful number, since it uses less digits than its factorization.

21693344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4332 (or 4324 counting only the distinct ones).

The product of its digits is 15552, while the sum is 32.

The square root of 21693344 is about 4657.6114050015. The cubic root of 21693344 is about 278.8959243199.

The spelling of 21693344 in words is "twenty-one million, six hundred ninety-three thousand, three hundred forty-four".