21944271 has 8 divisors (see below), whose sum is σ = 30268080. Its totient is φ = 14124992.

The previous prime is 21944269. The next prime is 21944291. The reversal of 21944271 is 17244912.

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 21944271 - 2¹ = 21944269 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21944291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 126030 + ... + 126203.

It is an arithmetic number, because the mean of its divisors is an integer number (3783510).

Almost surely, 2^21944271 is an apocalyptic number.

21944271 is a deficient number, since it is larger than the sum of its proper divisors (8323809).

21944271 is a wasteful number, since it uses less digits than its factorization.

21944271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252265.

The product of its digits is 4032, while the sum is 30.

The square root of 21944271 is about 4684.4712615193. The cubic root of 21944271 is about 279.9671347480.

The spelling of 21944271 in words is "twenty-one million, nine hundred forty-four thousand, two hundred seventy-one".