11231203111 has 2 divisors, whose sum is σ = 11231203112. Its totient is φ = 11231203110.

The previous prime is 11231203097. The next prime is 11231203133. The reversal of 11231203111 is 11130213211.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11231203111 - 2²⁹ = 10694332199 is a prime.

It is a super-2 number, since 2×11231203111² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11231203141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5615601555 + 5615601556.

It is an arithmetic number, because the mean of its divisors is an integer number (5615601556).

Almost surely, 2^11231203111 is an apocalyptic number.

11231203111 is a deficient number, since it is larger than the sum of its proper divisors (1).

11231203111 is an equidigital number, since it uses as much as digits as its factorization.

11231203111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 11231203111 its reverse (11130213211), we get a palindrome (22361416322).

The spelling of 11231203111 in words is "eleven billion, two hundred thirty-one million, two hundred three thousand, one hundred eleven".