21844227 has 8 divisors (see below), whose sum is σ = 30392064. Its totient is φ = 13929608.

The previous prime is 21844223. The next prime is 21844241. The reversal of 21844227 is 72244812.

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 21844227 - 2² = 21844223 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21844194 and 21844203.

It is not an unprimeable number, because it can be changed into a prime (21844223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 158223 + ... + 158360.

It is an arithmetic number, because the mean of its divisors is an integer number (3799008).

Almost surely, 2^21844227 is an apocalyptic number.

21844227 is a deficient number, since it is larger than the sum of its proper divisors (8547837).

21844227 is a wasteful number, since it uses less digits than its factorization.

21844227 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316609.

The product of its digits is 7168, while the sum is 30.

The square root of 21844227 is about 4673.7808035893. The cubic root of 21844227 is about 279.5410295384.

The spelling of 21844227 in words is "twenty-one million, eight hundred forty-four thousand, two hundred twenty-seven".