21796853 has 8 divisors (see below), whose sum is σ = 23562168. Its totient is φ = 20044224.

The previous prime is 21796843. The next prime is 21796867. The reversal of 21796853 is 35869712.

It can be written as a sum of positive squares in 4 ways, for example, as 1203409 + 20593444 = 1097^2 + 4538^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21796853 - 2¹⁴ = 21780469 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 21796853.

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 7 ways as a sum of consecutive naturals, for example, 575 + ... + 6627.

It is an arithmetic number, because the mean of its divisors is an integer number (2945271).

Almost surely, 2^21796853 is an apocalyptic number.

It is an amenable number.

21796853 is a deficient number, since it is larger than the sum of its proper divisors (1765315).

21796853 is a wasteful number, since it uses less digits than its factorization.

21796853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6343.

The product of its digits is 90720, while the sum is 41.

The square root of 21796853 is about 4668.7099931351. The cubic root of 21796853 is about 279.3388012529.

The spelling of 21796853 in words is "twenty-one million, seven hundred ninety-six thousand, eight hundred fifty-three".