21766793 has 4 divisors (see below), whose sum is σ = 21817728. Its totient is φ = 21715860.

The previous prime is 21766757. The next prime is 21766831. The reversal of 21766793 is 39766712.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21766793 - 2¹⁰ = 21765769 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21766793.

It is not an unprimeable number, because it can be changed into a prime (21766753) 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, 24821 + ... + 25682.

It is an arithmetic number, because the mean of its divisors is an integer number (5454432).

Almost surely, 2^21766793 is an apocalyptic number.

It is an amenable number.

21766793 is a deficient number, since it is larger than the sum of its proper divisors (50935).

21766793 is an equidigital number, since it uses as much as digits as its factorization.

21766793 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50934.

The product of its digits is 95256, while the sum is 41.

The square root of 21766793 is about 4665.4895777399. The cubic root of 21766793 is about 279.2103303006.

The spelling of 21766793 in words is "twenty-one million, seven hundred sixty-six thousand, seven hundred ninety-three".