21726327 has 16 divisors (see below), whose sum is σ = 33178880. Its totient is φ = 12388032.

The previous prime is 21726317. The next prime is 21726349. The reversal of 21726327 is 72362712.

It is not a de Polignac number, because 21726327 - 2⁴ = 21726311 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21726294 and 21726303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21726317) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 12699 + ... + 14307.

It is an arithmetic number, because the mean of its divisors is an integer number (2073680).

Almost surely, 2^21726327 is an apocalyptic number.

21726327 is a deficient number, since it is larger than the sum of its proper divisors (11452553).

21726327 is a wasteful number, since it uses less digits than its factorization.

21726327 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2262.

The product of its digits is 7056, while the sum is 30.

The square root of 21726327 is about 4661.1508235628. The cubic root of 21726327 is about 279.0371990842.

The spelling of 21726327 in words is "twenty-one million, seven hundred twenty-six thousand, three hundred twenty-seven".