21888255 has 8 divisors (see below), whose sum is σ = 35021232. Its totient is φ = 11673728.

The previous prime is 21888199. The next prime is 21888259. The reversal of 21888255 is 55288812.

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 21888255 - 2¹⁰ = 21887231 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21888259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 729594 + ... + 729623.

It is an arithmetic number, because the mean of its divisors is an integer number (4377654).

Almost surely, 2^21888255 is an apocalyptic number.

21888255 is a deficient number, since it is larger than the sum of its proper divisors (13132977).

21888255 is a wasteful number, since it uses less digits than its factorization.

21888255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1459225.

The product of its digits is 51200, while the sum is 39.

The square root of 21888255 is about 4678.4885379789. The cubic root of 21888255 is about 279.7287125791.

The spelling of 21888255 in words is "twenty-one million, eight hundred eighty-eight thousand, two hundred fifty-five".