21944593 has 8 divisors (see below), whose sum is σ = 24010560. Its totient is φ = 19890480.

The previous prime is 21944581. The next prime is 21944651. The reversal of 21944593 is 39544912.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21944593 - 2⁹ = 21944081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21944393) 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, 1171 + ... + 6727.

It is an arithmetic number, because the mean of its divisors is an integer number (3001320).

Almost surely, 2^21944593 is an apocalyptic number.

It is an amenable number.

21944593 is a deficient number, since it is larger than the sum of its proper divisors (2065967).

21944593 is a wasteful number, since it uses less digits than its factorization.

21944593 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5927.

The product of its digits is 38880, while the sum is 37.

The square root of 21944593 is about 4684.5056302667. The cubic root of 21944593 is about 279.9685041104.

The spelling of 21944593 in words is "twenty-one million, nine hundred forty-four thousand, five hundred ninety-three".