21794775 has 12 divisors (see below), whose sum is σ = 36034152. Its totient is φ = 11623840.

The previous prime is 21794761. The next prime is 21794779. The reversal of 21794775 is 57749712.

It is not a de Polignac number, because 21794775 - 2⁵ = 21794743 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21794779) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 145224 + ... + 145373.

It is an arithmetic number, because the mean of its divisors is an integer number (3002846).

Almost surely, 2^21794775 is an apocalyptic number.

21794775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21794775 is a deficient number, since it is larger than the sum of its proper divisors (14239377).

21794775 is a wasteful number, since it uses less digits than its factorization.

21794775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290610 (or 290605 counting only the distinct ones).

The product of its digits is 123480, while the sum is 42.

The square root of 21794775 is about 4668.4874424164. The cubic root of 21794775 is about 279.3299240620.

The spelling of 21794775 in words is "twenty-one million, seven hundred ninety-four thousand, seven hundred seventy-five".