21793534 has 16 divisors (see below), whose sum is σ = 38124000. Its totient is φ = 9339792.

The previous prime is 21793523. The next prime is 21793537. The reversal of 21793534 is 43539712.

It is a self number, because there is not a number n which added to its sum of digits gives 21793534.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21793537) 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, 15199 + ... + 16570.

It is an arithmetic number, because the mean of its divisors is an integer number (2382750).

Almost surely, 2^21793534 is an apocalyptic number.

21793534 is a deficient number, since it is larger than the sum of its proper divisors (16330466).

21793534 is an equidigital number, since it uses as much as digits as its factorization.

21793534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31792 (or 31778 counting only the distinct ones).

The product of its digits is 22680, while the sum is 34.

The square root of 21793534 is about 4668.3545280966. The cubic root of 21793534 is about 279.3246222559.

The spelling of 21793534 in words is "twenty-one million, seven hundred ninety-three thousand, five hundred thirty-four".