21852223 has 4 divisors (see below), whose sum is σ = 23002360. Its totient is φ = 20702088.

The previous prime is 21852203. The next prime is 21852239. The reversal of 21852223 is 32225812.

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

It is a cyclic number.

It is not a de Polignac number, because 21852223 - 2¹⁷ = 21721151 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21852203) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 575040 + ... + 575077.

It is an arithmetic number, because the mean of its divisors is an integer number (5750590).

Almost surely, 2^21852223 is an apocalyptic number.

21852223 is a deficient number, since it is larger than the sum of its proper divisors (1150137).

21852223 is a wasteful number, since it uses less digits than its factorization.

21852223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1150136.

The product of its digits is 1920, while the sum is 25.

The square root of 21852223 is about 4674.6361355725. The cubic root of 21852223 is about 279.5751337038.

It can be divided in two parts, 218 and 52223, that added together give a square (52441 = 229²).

The spelling of 21852223 in words is "twenty-one million, eight hundred fifty-two thousand, two hundred twenty-three".