21888705 has 16 divisors (see below), whose sum is σ = 35616960. Its totient is φ = 11475648.

The previous prime is 21888689. The next prime is 21888721. The reversal of 21888705 is 50788812.

It is an interprime number because it is at equal distance from previous prime (21888689) and next prime (21888721).

It is not a de Polignac number, because 21888705 - 2⁴ = 21888689 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11482 + ... + 13251.

It is an arithmetic number, because the mean of its divisors is an integer number (2226060).

Almost surely, 2^21888705 is an apocalyptic number.

It is an amenable number.

21888705 is a deficient number, since it is larger than the sum of its proper divisors (13728255).

21888705 is a wasteful number, since it uses less digits than its factorization.

21888705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24800.

The product of its (nonzero) digits is 35840, while the sum is 39.

The square root of 21888705 is about 4678.5366301868. The cubic root of 21888705 is about 279.7306295441.

The spelling of 21888705 in words is "twenty-one million, eight hundred eighty-eight thousand, seven hundred five".