11011223231 has 2 divisors, whose sum is σ = 11011223232. Its totient is φ = 11011223230.

The previous prime is 11011223177. The next prime is 11011223233. The reversal of 11011223231 is 13232211011.

It is a strong prime.

It is an emirp because it is prime and its reverse (13232211011) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11011223231 is a prime.

It is a super-2 number, since 2×11011223231² (a number of 21 digits) contains 22 as substring.

Together with 11011223233, 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 (11011223233) 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, 5505611615 + 5505611616.

It is an arithmetic number, because the mean of its divisors is an integer number (5505611616).

Almost surely, 2^11011223231 is an apocalyptic number.

11011223231 is a deficient number, since it is larger than the sum of its proper divisors (1).

11011223231 is an equidigital number, since it uses as much as digits as its factorization.

11011223231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 11011223231 its reverse (13232211011), we get a palindrome (24243434242).

The spelling of 11011223231 in words is "eleven billion, eleven million, two hundred twenty-three thousand, two hundred thirty-one".