21751403263 has 2 divisors, whose sum is σ = 21751403264. Its totient is φ = 21751403262.

The previous prime is 21751403251. The next prime is 21751403291. The reversal of 21751403263 is 36230415712.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21751403263 - 2²⁹ = 21214532351 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21751403293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10875701631 + 10875701632.

It is an arithmetic number, because the mean of its divisors is an integer number (10875701632).

Almost surely, 2^21751403263 is an apocalyptic number.

21751403263 is a deficient number, since it is larger than the sum of its proper divisors (1).

21751403263 is an equidigital number, since it uses as much as digits as its factorization.

21751403263 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30240, while the sum is 34.

Adding to 21751403263 its reverse (36230415712), we get a palindrome (57981818975).

The spelling of 21751403263 in words is "twenty-one billion, seven hundred fifty-one million, four hundred three thousand, two hundred sixty-three".