21606485 has 8 divisors (see below), whose sum is σ = 26126496. Its totient is φ = 17152720.

The previous prime is 21606469. The next prime is 21606491. The reversal of 21606485 is 58460612.

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

It is not a de Polignac number, because 21606485 - 2⁴ = 21606469 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 (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15839 + ... + 17148.

It is an arithmetic number, because the mean of its divisors is an integer number (3265812).

Almost surely, 2^21606485 is an apocalyptic number.

It is an amenable number.

21606485 is a deficient number, since it is larger than the sum of its proper divisors (4520011).

21606485 is a wasteful number, since it uses less digits than its factorization.

21606485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33123.

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 21606485 is about 4648.2776380074. The cubic root of 21606485 is about 278.5231982498.

The spelling of 21606485 in words is "twenty-one million, six hundred six thousand, four hundred eighty-five".