21888027 has 48 divisors (see below), whose sum is σ = 38817792. Its totient is φ = 11600640.

The previous prime is 21888023. The next prime is 21888071. The reversal of 21888027 is 72088812.

It is not a de Polignac number, because 21888027 - 2² = 21888023 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21887982 and 21888000.

It is not an unprimeable number, because it can be changed into a prime (21888023) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 114502 + ... + 114692.

It is an arithmetic number, because the mean of its divisors is an integer number (808704).

Almost surely, 2^21888027 is an apocalyptic number.

21888027 is a deficient number, since it is larger than the sum of its proper divisors (16929765).

21888027 is a wasteful number, since it uses less digits than its factorization.

21888027 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 328 (or 325 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 36.

The square root of 21888027 is about 4678.4641710715. The cubic root of 21888027 is about 279.7277413068.

The spelling of 21888027 in words is "twenty-one million, eight hundred eighty-eight thousand, twenty-seven".