21888361 has 8 divisors (see below), whose sum is σ = 25135200. Its totient is φ = 18851040.

The previous prime is 21888331. The next prime is 21888379. The reversal of 21888361 is 16388812.

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

It is not a de Polignac number, because 21888361 - 2⁹ = 21887849 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 21888361.

It is not an unprimeable number, because it can be changed into a prime (21888331) 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, 52156 + ... + 52573.

It is an arithmetic number, because the mean of its divisors is an integer number (3141900).

Almost surely, 2^21888361 is an apocalyptic number.

It is an amenable number.

21888361 is a deficient number, since it is larger than the sum of its proper divisors (3246839).

21888361 is a wasteful number, since it uses less digits than its factorization.

21888361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104759.

The product of its digits is 18432, while the sum is 37.

The square root of 21888361 is about 4678.4998664102. The cubic root of 21888361 is about 279.7291641332.

The spelling of 21888361 in words is "twenty-one million, eight hundred eighty-eight thousand, three hundred sixty-one".