21089075 has 24 divisors (see below), whose sum is σ = 30703392. Its totient is φ = 14065920.

The previous prime is 21089051. The next prime is 21089087. The reversal of 21089075 is 57098012.

It is not a de Polignac number, because 21089075 - 2⁶ = 21089011 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4847 + ... + 8103.

It is an arithmetic number, because the mean of its divisors is an integer number (1279308).

Almost surely, 2^21089075 is an apocalyptic number.

21089075 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21089075 is a deficient number, since it is larger than the sum of its proper divisors (9614317).

21089075 is a wasteful number, since it uses less digits than its factorization.

21089075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3311 (or 3306 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 32.

The square root of 21089075 is about 4592.2842899803. The cubic root of 21089075 is about 276.2819486264.

The spelling of 21089075 in words is "twenty-one million, eighty-nine thousand, seventy-five".