21688143263 has 2 divisors, whose sum is σ = 21688143264. Its totient is φ = 21688143262.

The previous prime is 21688143247. The next prime is 21688143283. The reversal of 21688143263 is 36234188612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21688143263 - 2⁴ = 21688143247 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21688143283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10844071631 + 10844071632.

It is an arithmetic number, because the mean of its divisors is an integer number (10844071632).

Almost surely, 2^21688143263 is an apocalyptic number.

21688143263 is a deficient number, since it is larger than the sum of its proper divisors (1).

21688143263 is an equidigital number, since it uses as much as digits as its factorization.

21688143263 is an evil number, because the sum of its binary digits is even.

The product of its digits is 331776, while the sum is 44.

The spelling of 21688143263 in words is "twenty-one billion, six hundred eighty-eight million, one hundred forty-three thousand, two hundred sixty-three".