21888673591 has 2 divisors, whose sum is σ = 21888673592. Its totient is φ = 21888673590.

The previous prime is 21888673589. The next prime is 21888673627. The reversal of 21888673591 is 19537688812.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21888673591 - 2¹ = 21888673589 is a prime.

It is a super-2 number, since 2×21888673591² (a number of 21 digits) contains 22 as substring.

Together with 21888673589, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21888673691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10944336795 + 10944336796.

It is an arithmetic number, because the mean of its divisors is an integer number (10944336796).

Almost surely, 2^21888673591 is an apocalyptic number.

21888673591 is a deficient number, since it is larger than the sum of its proper divisors (1).

21888673591 is an equidigital number, since it uses as much as digits as its factorization.

21888673591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5806080, while the sum is 58.

The spelling of 21888673591 in words is "twenty-one billion, eight hundred eighty-eight million, six hundred seventy-three thousand, five hundred ninety-one".