21994585 has 8 divisors (see below), whose sum is σ = 26712000. Its totient is φ = 17383344.

The previous prime is 21994561. The next prime is 21994589. The reversal of 21994585 is 58549912.

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 21994585 - 2¹⁵ = 21961817 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21994589) 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, 26085 + ... + 26914.

It is an arithmetic number, because the mean of its divisors is an integer number (3339000).

Almost surely, 2^21994585 is an apocalyptic number.

It is an amenable number.

21994585 is a deficient number, since it is larger than the sum of its proper divisors (4717415).

21994585 is an equidigital number, since it uses as much as digits as its factorization.

21994585 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53087.

The product of its digits is 129600, while the sum is 43.

The square root of 21994585 is about 4689.8384833595. The cubic root of 21994585 is about 280.1809417200.

The spelling of 21994585 in words is "twenty-one million, nine hundred ninety-four thousand, five hundred eighty-five".