21888985 has 8 divisors (see below), whose sum is σ = 27408960. Its totient is φ = 16749744.

The previous prime is 21888973. The next prime is 21888989. The reversal of 21888985 is 58988812.

It is a happy number.

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 21888985 - 2⁵ = 21888953 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21888989) 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, 95055 + ... + 95284.

It is an arithmetic number, because the mean of its divisors is an integer number (3426120).

Almost surely, 2^21888985 is an apocalyptic number.

It is an amenable number.

21888985 is a deficient number, since it is larger than the sum of its proper divisors (5519975).

21888985 is a wasteful number, since it uses less digits than its factorization.

21888985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190367.

The product of its digits is 368640, while the sum is 49.

The square root of 21888985 is about 4678.5665539778. The cubic root of 21888985 is about 279.7318223091.

The spelling of 21888985 in words is "twenty-one million, eight hundred eighty-eight thousand, nine hundred eighty-five".