21324241349 has 2 divisors, whose sum is σ = 21324241350. Its totient is φ = 21324241348.

The previous prime is 21324241319. The next prime is 21324241357. The reversal of 21324241349 is 94314242312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18806008225 + 2518233124 = 137135^2 + 50182^2 .

It is a cyclic number.

It is not a de Polignac number, because 21324241349 - 2⁸ = 21324241093 is a prime.

It is a super-2 number, since 2×21324241349² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21324241319) 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, 10662120674 + 10662120675.

It is an arithmetic number, because the mean of its divisors is an integer number (10662120675).

Almost surely, 2^21324241349 is an apocalyptic number.

It is an amenable number.

21324241349 is a deficient number, since it is larger than the sum of its proper divisors (1).

21324241349 is an equidigital number, since it uses as much as digits as its factorization.

21324241349 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 41472, while the sum is 35.

The spelling of 21324241349 in words is "twenty-one billion, three hundred twenty-four million, two hundred forty-one thousand, three hundred forty-nine".