21432244241 has 2 divisors, whose sum is σ = 21432244242. Its totient is φ = 21432244240.

The previous prime is 21432244219. The next prime is 21432244247. The reversal of 21432244241 is 14244223412.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20533743616 + 898500625 = 143296^2 + 29975^2 .

It is a cyclic number.

It is not a de Polignac number, because 21432244241 - 2¹⁸ = 21431982097 is a prime.

It is not a weakly prime, because it can be changed into another prime (21432244247) 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 as a sum of consecutive naturals, namely, 10716122120 + 10716122121.

It is an arithmetic number, because the mean of its divisors is an integer number (10716122121).

Almost surely, 2^21432244241 is an apocalyptic number.

It is an amenable number.

21432244241 is a deficient number, since it is larger than the sum of its proper divisors (1).

21432244241 is an equidigital number, since it uses as much as digits as its factorization.

21432244241 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12288, while the sum is 29.

Adding to 21432244241 its reverse (14244223412), we get a palindrome (35676467653).

The spelling of 21432244241 in words is "twenty-one billion, four hundred thirty-two million, two hundred forty-four thousand, two hundred forty-one".