21888146 has 16 divisors (see below), whose sum is σ = 39730176. Its totient is φ = 8828736.

The previous prime is 21888131. The next prime is 21888151. The reversal of 21888146 is 64188812.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45746 + ... + 46221.

It is an arithmetic number, because the mean of its divisors is an integer number (2483136).

Almost surely, 2^21888146 is an apocalyptic number.

21888146 is a deficient number, since it is larger than the sum of its proper divisors (17842030).

21888146 is a wasteful number, since it uses less digits than its factorization.

21888146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91993.

The product of its digits is 24576, while the sum is 38.

The square root of 21888146 is about 4678.4768889031. The cubic root of 21888146 is about 279.7282482436.

The spelling of 21888146 in words is "twenty-one million, eight hundred eighty-eight thousand, one hundred forty-six".