21864227911 has 2 divisors, whose sum is σ = 21864227912. Its totient is φ = 21864227910.

The previous prime is 21864227857. The next prime is 21864227929. The reversal of 21864227911 is 11972246812.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21864227911 - 2¹¹ = 21864225863 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21864227971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10932113955 + 10932113956.

It is an arithmetic number, because the mean of its divisors is an integer number (10932113956).

Almost surely, 2^21864227911 is an apocalyptic number.

21864227911 is a deficient number, since it is larger than the sum of its proper divisors (1).

21864227911 is an equidigital number, since it uses as much as digits as its factorization.

21864227911 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96768, while the sum is 43.

The spelling of 21864227911 in words is "twenty-one billion, eight hundred sixty-four million, two hundred twenty-seven thousand, nine hundred eleven".