22111989551 has 2 divisors, whose sum is σ = 22111989552. Its totient is φ = 22111989550.

The previous prime is 22111989521. The next prime is 22111989553. The reversal of 22111989551 is 15598911122.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22111989551 is a prime.

Together with 22111989553, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22111989553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11055994775 + 11055994776.

It is an arithmetic number, because the mean of its divisors is an integer number (11055994776).

Almost surely, 2^22111989551 is an apocalyptic number.

22111989551 is a deficient number, since it is larger than the sum of its proper divisors (1).

22111989551 is an equidigital number, since it uses as much as digits as its factorization.

22111989551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64800, while the sum is 44.

The spelling of 22111989551 in words is "twenty-two billion, one hundred eleven million, nine hundred eighty-nine thousand, five hundred fifty-one".