21888259 has 2 divisors, whose sum is σ = 21888260. Its totient is φ = 21888258.

The previous prime is 21888199. The next prime is 21888271. The reversal of 21888259 is 95288812.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21888259 - 2⁷ = 21888131 is a prime.

It is not a weakly prime, because it can be changed into another prime (21888859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10944129 + 10944130.

It is an arithmetic number, because the mean of its divisors is an integer number (10944130).

Almost surely, 2^21888259 is an apocalyptic number.

21888259 is a deficient number, since it is larger than the sum of its proper divisors (1).

21888259 is an equidigital number, since it uses as much as digits as its factorization.

21888259 is an evil number, because the sum of its binary digits is even.

The product of its digits is 92160, while the sum is 43.

The square root of 21888259 is about 4678.4889654674. The cubic root of 21888259 is about 279.7287296189.

The spelling of 21888259 in words is "twenty-one million, eight hundred eighty-eight thousand, two hundred fifty-nine".