21844027 has 2 divisors, whose sum is σ = 21844028. Its totient is φ = 21844026.

The previous prime is 21844019. The next prime is 21844033. The reversal of 21844027 is 72044812.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21844027 - 2³ = 21844019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21843986 and 21844004.

It is not a weakly prime, because it can be changed into another prime (21844007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10922013 + 10922014.

It is an arithmetic number, because the mean of its divisors is an integer number (10922014).

Almost surely, 2^21844027 is an apocalyptic number.

21844027 is a deficient number, since it is larger than the sum of its proper divisors (1).

21844027 is an equidigital number, since it uses as much as digits as its factorization.

21844027 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3584, while the sum is 28.

The square root of 21844027 is about 4673.7594075861. The cubic root of 21844027 is about 279.5401764010.

Adding to 21844027 its reverse (72044812), we get a palindrome (93888839).

The spelling of 21844027 in words is "twenty-one million, eight hundred forty-four thousand, twenty-seven".