21589117 has 8 divisors (see below), whose sum is σ = 23591520. Its totient is φ = 19593360.

The previous prime is 21589097. The next prime is 21589123. The reversal of 21589117 is 71198512.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21589117 - 2¹⁵ = 21556349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21589517) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7234 + ... + 9772.

It is an arithmetic number, because the mean of its divisors is an integer number (2948940).

Almost surely, 2^21589117 is an apocalyptic number.

It is an amenable number.

21589117 is a deficient number, since it is larger than the sum of its proper divisors (2002403).

21589117 is a wasteful number, since it uses less digits than its factorization.

21589117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3323.

The product of its digits is 5040, while the sum is 34.

The square root of 21589117 is about 4646.4090435518. The cubic root of 21589117 is about 278.4485495562.

The spelling of 21589117 in words is "twenty-one million, five hundred eighty-nine thousand, one hundred seventeen".