21089571 has 8 divisors (see below), whose sum is σ = 29773584. Its totient is φ = 13232640.

The previous prime is 21089569. The next prime is 21089573. The reversal of 21089571 is 17598012.

It is an interprime number because it is at equal distance from previous prime (21089569) and next prime (21089573).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21089571 - 2¹ = 21089569 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21089573) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 206710 + ... + 206811.

It is an arithmetic number, because the mean of its divisors is an integer number (3721698).

Almost surely, 2^21089571 is an apocalyptic number.

21089571 is a deficient number, since it is larger than the sum of its proper divisors (8684013).

21089571 is a wasteful number, since it uses less digits than its factorization.

21089571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 413541.

The product of its (nonzero) digits is 5040, while the sum is 33.

The square root of 21089571 is about 4592.3382932881. The cubic root of 21089571 is about 276.2841145942.

The spelling of 21089571 in words is "twenty-one million, eighty-nine thousand, five hundred seventy-one".