21888608263 has 2 divisors, whose sum is σ = 21888608264. Its totient is φ = 21888608262.

The previous prime is 21888608257. The next prime is 21888608267. The reversal of 21888608263 is 36280688812.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21888608263 is a prime.

It is a super-2 number, since 2×21888608263² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21888608263.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21888608267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10944304131 + 10944304132.

It is an arithmetic number, because the mean of its divisors is an integer number (10944304132).

Almost surely, 2^21888608263 is an apocalyptic number.

21888608263 is a deficient number, since it is larger than the sum of its proper divisors (1).

21888608263 is an equidigital number, since it uses as much as digits as its factorization.

21888608263 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1769472, while the sum is 52.

The spelling of 21888608263 in words is "twenty-one billion, eight hundred eighty-eight million, six hundred eight thousand, two hundred sixty-three".