21883217 has 4 divisors (see below), whose sum is σ = 22416996. Its totient is φ = 21349440.

The previous prime is 21883207. The next prime is 21883249. The reversal of 21883217 is 71238812.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1893376 + 19989841 = 1376^2 + 4471^2 .

It is a cyclic number.

It is not a de Polignac number, because 21883217 - 2¹⁸ = 21621073 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21883207) 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, 266828 + ... + 266909.

It is an arithmetic number, because the mean of its divisors is an integer number (5604249).

Almost surely, 2^21883217 is an apocalyptic number.

It is an amenable number.

21883217 is a deficient number, since it is larger than the sum of its proper divisors (533779).

21883217 is an equidigital number, since it uses as much as digits as its factorization.

21883217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 533778.

The product of its digits is 5376, while the sum is 32.

The square root of 21883217 is about 4677.9500852403. The cubic root of 21883217 is about 279.7072492967.

The spelling of 21883217 in words is "twenty-one million, eight hundred eighty-three thousand, two hundred seventeen".