21736726 has 8 divisors (see below), whose sum is σ = 35569224. Its totient is φ = 9880320.

The previous prime is 21736711. The next prime is 21736753. The reversal of 21736726 is 62763712.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 21736691 and 21736700.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 493995 + ... + 494038.

It is an arithmetic number, because the mean of its divisors is an integer number (4446153).

Almost surely, 2^21736726 is an apocalyptic number.

21736726 is a deficient number, since it is larger than the sum of its proper divisors (13832498).

21736726 is a wasteful number, since it uses less digits than its factorization.

21736726 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 988046.

The product of its digits is 21168, while the sum is 34.

The square root of 21736726 is about 4662.2661871669. The cubic root of 21736726 is about 279.0817110566.

The spelling of 21736726 in words is "twenty-one million, seven hundred thirty-six thousand, seven hundred twenty-six".