21344424263 has 2 divisors, whose sum is σ = 21344424264. Its totient is φ = 21344424262.

The previous prime is 21344424259. The next prime is 21344424293. The reversal of 21344424263 is 36242444312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21344424263 - 2² = 21344424259 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21344424293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10672212131 + 10672212132.

It is an arithmetic number, because the mean of its divisors is an integer number (10672212132).

Almost surely, 2^21344424263 is an apocalyptic number.

21344424263 is a deficient number, since it is larger than the sum of its proper divisors (1).

21344424263 is an equidigital number, since it uses as much as digits as its factorization.

21344424263 is an evil number, because the sum of its binary digits is even.

The product of its digits is 110592, while the sum is 35.

Adding to 21344424263 its reverse (36242444312), we get a palindrome (57586868575).

The spelling of 21344424263 in words is "twenty-one billion, three hundred forty-four million, four hundred twenty-four thousand, two hundred sixty-three".