21894773 has 4 divisors (see below), whose sum is σ = 22601088. Its totient is φ = 21188460.

The previous prime is 21894751. The next prime is 21894839. The reversal of 21894773 is 37749812.

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 21894773 - 2¹⁰ = 21893749 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 21894773.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21894703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 353111 + ... + 353172.

It is an arithmetic number, because the mean of its divisors is an integer number (5650272).

Almost surely, 2^21894773 is an apocalyptic number.

It is an amenable number.

21894773 is a deficient number, since it is larger than the sum of its proper divisors (706315).

21894773 is an equidigital number, since it uses as much as digits as its factorization.

21894773 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 706314.

The product of its digits is 84672, while the sum is 41.

The square root of 21894773 is about 4679.1850786221. The cubic root of 21894773 is about 279.7564761871.

The spelling of 21894773 in words is "twenty-one million, eight hundred ninety-four thousand, seven hundred seventy-three".