21444212443 has 2 divisors, whose sum is σ = 21444212444. Its totient is φ = 21444212442.

The previous prime is 21444212389. The next prime is 21444212477. The reversal of 21444212443 is 34421244412.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21444212443 - 2¹⁷ = 21444081371 is a prime.

It is not a weakly prime, because it can be changed into another prime (21444218443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10722106221 + 10722106222.

It is an arithmetic number, because the mean of its divisors is an integer number (10722106222).

Almost surely, 2^21444212443 is an apocalyptic number.

21444212443 is a deficient number, since it is larger than the sum of its proper divisors (1).

21444212443 is an equidigital number, since it uses as much as digits as its factorization.

21444212443 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24576, while the sum is 31.

Adding to 21444212443 its reverse (34421244412), we get a palindrome (55865456855).

The spelling of 21444212443 in words is "twenty-one billion, four hundred forty-four million, two hundred twelve thousand, four hundred forty-three".