21443027 has 4 divisors (see below), whose sum is σ = 21467280. Its totient is φ = 21418776.

The previous prime is 21443003. The next prime is 21443033. The reversal of 21443027 is 72034412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21443027 - 2¹² = 21438931 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21442993 and 21443011.

It is not an unprimeable number, because it can be changed into a prime (21443047) 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 3 ways as a sum of consecutive naturals, for example, 10748 + ... + 12585.

It is an arithmetic number, because the mean of its divisors is an integer number (5366820).

Almost surely, 2^21443027 is an apocalyptic number.

21443027 is a deficient number, since it is larger than the sum of its proper divisors (24253).

21443027 is an equidigital number, since it uses as much as digits as its factorization.

21443027 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24252.

The product of its (nonzero) digits is 1344, while the sum is 23.

The square root of 21443027 is about 4630.6616157953. The cubic root of 21443027 is about 277.8190556910.

Adding to 21443027 its reverse (72034412), we get a palindrome (93477439).

The spelling of 21443027 in words is "twenty-one million, four hundred forty-three thousand, twenty-seven".