21888673847 has 2 divisors, whose sum is σ = 21888673848. Its totient is φ = 21888673846.

The previous prime is 21888673841. The next prime is 21888673871. The reversal of 21888673847 is 74837688812.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21888673847 - 2⁸ = 21888673591 is a prime.

It is a super-2 number, since 2×21888673847² (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 21888673847.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21888673841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10944336923 + 10944336924.

It is an arithmetic number, because the mean of its divisors is an integer number (10944336924).

Almost surely, 2^21888673847 is an apocalyptic number.

21888673847 is a deficient number, since it is larger than the sum of its proper divisors (1).

21888673847 is an equidigital number, since it uses as much as digits as its factorization.

21888673847 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28901376, while the sum is 62.

The spelling of 21888673847 in words is "twenty-one billion, eight hundred eighty-eight million, six hundred seventy-three thousand, eight hundred forty-seven".