21726485 has 8 divisors (see below), whose sum is σ = 28442016. Its totient is φ = 15801040.

The previous prime is 21726473. The next prime is 21726491. The reversal of 21726485 is 58462712.

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

It is a de Polignac number, because none of the positive numbers 2^k-21726485 is a prime.

It is a Duffinian number.

It is a Curzon 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, 197459 + ... + 197568.

It is an arithmetic number, because the mean of its divisors is an integer number (3555252).

Almost surely, 2^21726485 is an apocalyptic number.

It is an amenable number.

21726485 is a deficient number, since it is larger than the sum of its proper divisors (6715531).

21726485 is a wasteful number, since it uses less digits than its factorization.

21726485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395043.

The product of its digits is 26880, while the sum is 35.

The square root of 21726485 is about 4661.1677721361. The cubic root of 21726485 is about 279.0378754950.

The spelling of 21726485 in words is "twenty-one million, seven hundred twenty-six thousand, four hundred eighty-five".