21331344241 has 2 divisors, whose sum is σ = 21331344242. Its totient is φ = 21331344240.

The previous prime is 21331344233. The next prime is 21331344247. The reversal of 21331344241 is 14244313312.

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., 19354652641 + 1976691600 = 139121^2 + 44460^2 .

It is a cyclic number.

It is not a de Polignac number, because 21331344241 - 2³ = 21331344233 is a prime.

It is not a weakly prime, because it can be changed into another prime (21331344247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10665672120 + 10665672121.

It is an arithmetic number, because the mean of its divisors is an integer number (10665672121).

Almost surely, 2^21331344241 is an apocalyptic number.

It is an amenable number.

21331344241 is a deficient number, since it is larger than the sum of its proper divisors (1).

21331344241 is an equidigital number, since it uses as much as digits as its factorization.

21331344241 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6912, while the sum is 28.

Adding to 21331344241 its reverse (14244313312), we get a palindrome (35575657553).

The spelling of 21331344241 in words is "twenty-one billion, three hundred thirty-one million, three hundred forty-four thousand, two hundred forty-one".