21796845 has 16 divisors (see below), whose sum is σ = 39857280. Its totient is φ = 9964224.

The previous prime is 21796843. The next prime is 21796867. The reversal of 21796845 is 54869712.

It is not a de Polignac number, because 21796845 - 2¹ = 21796843 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21796797 and 21796806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21796843) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 103690 + ... + 103899.

It is an arithmetic number, because the mean of its divisors is an integer number (2491080).

Almost surely, 2^21796845 is an apocalyptic number.

It is an amenable number.

21796845 is a deficient number, since it is larger than the sum of its proper divisors (18060435).

21796845 is a wasteful number, since it uses less digits than its factorization.

21796845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207604.

The product of its digits is 120960, while the sum is 42.

The square root of 21796845 is about 4668.7091363674. The cubic root of 21796845 is about 279.3387670781.

The spelling of 21796845 in words is "twenty-one million, seven hundred ninety-six thousand, eight hundred forty-five".