12101111551 has 2 divisors, whose sum is σ = 12101111552. Its totient is φ = 12101111550.

The previous prime is 12101111543. The next prime is 12101111569. The reversal of 12101111551 is 15511110121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12101111551 - 2³ = 12101111543 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12101111531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6050555775 + 6050555776.

It is an arithmetic number, because the mean of its divisors is an integer number (6050555776).

Almost surely, 2^12101111551 is an apocalyptic number.

12101111551 is a deficient number, since it is larger than the sum of its proper divisors (1).

12101111551 is an equidigital number, since it uses as much as digits as its factorization.

12101111551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 50, while the sum is 19.

Adding to 12101111551 its reverse (15511110121), we get a palindrome (27612221672).

The spelling of 12101111551 in words is "twelve billion, one hundred one million, one hundred eleven thousand, five hundred fifty-one".