11188767221 has 2 divisors, whose sum is σ = 11188767222. Its totient is φ = 11188767220.

The previous prime is 11188767169. The next prime is 11188767259. The reversal of 11188767221 is 12276788111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8369688196 + 2819079025 = 91486^2 + 53095^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11188767221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11188760221) 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, 5594383610 + 5594383611.

It is an arithmetic number, because the mean of its divisors is an integer number (5594383611).

Almost surely, 2^11188767221 is an apocalyptic number.

It is an amenable number.

11188767221 is a deficient number, since it is larger than the sum of its proper divisors (1).

11188767221 is an equidigital number, since it uses as much as digits as its factorization.

11188767221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 75264, while the sum is 44.

The spelling of 11188767221 in words is "eleven billion, one hundred eighty-eight million, seven hundred sixty-seven thousand, two hundred twenty-one".