21889975 has 12 divisors (see below), whose sum is σ = 27257184. Its totient is φ = 17438720.

The previous prime is 21889963. The next prime is 21889981. The reversal of 21889975 is 57998812.

It is not a de Polignac number, because 21889975 - 2⁵ = 21889943 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4722 + ... + 8128.

It is an arithmetic number, because the mean of its divisors is an integer number (2271432).

Almost surely, 2^21889975 is an apocalyptic number.

21889975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21889975 is a deficient number, since it is larger than the sum of its proper divisors (5367209).

21889975 is a wasteful number, since it uses less digits than its factorization.

21889975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3674 (or 3669 counting only the distinct ones).

The product of its digits is 362880, while the sum is 49.

The square root of 21889975 is about 4678.6723544185. The cubic root of 21889975 is about 279.7360395037.

The spelling of 21889975 in words is "twenty-one million, eight hundred eighty-nine thousand, nine hundred seventy-five".