21413444263 has 2 divisors, whose sum is σ = 21413444264. Its totient is φ = 21413444262.

The previous prime is 21413444257. The next prime is 21413444267. The reversal of 21413444263 is 36244431412.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21413444263 is a prime.

It is a super-2 number, since 2×21413444263² (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 (21413444267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10706722131 + 10706722132.

It is an arithmetic number, because the mean of its divisors is an integer number (10706722132).

Almost surely, 2^21413444263 is an apocalyptic number.

21413444263 is a deficient number, since it is larger than the sum of its proper divisors (1).

21413444263 is an equidigital number, since it uses as much as digits as its factorization.

21413444263 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 55296, while the sum is 34.

Adding to 21413444263 its reverse (36244431412), we get a palindrome (57657875675).

The spelling of 21413444263 in words is "twenty-one billion, four hundred thirteen million, four hundred forty-four thousand, two hundred sixty-three".