201231223111 has 2 divisors, whose sum is σ = 201231223112. Its totient is φ = 201231223110.

The previous prime is 201231223021. The next prime is 201231223129. The reversal of 201231223111 is 111322132102.

201231223111 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 201231223111 - 2¹¹ = 201231221063 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201231223181) 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, 100615611555 + 100615611556.

It is an arithmetic number, because the mean of its divisors is an integer number (100615611556).

Almost surely, 2^201231223111 is an apocalyptic number.

201231223111 is a deficient number, since it is larger than the sum of its proper divisors (1).

201231223111 is an equidigital number, since it uses as much as digits as its factorization.

201231223111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 201231223111 its reverse (111322132102), we get a palindrome (312553355213).

The spelling of 201231223111 in words is "two hundred one billion, two hundred thirty-one million, two hundred twenty-three thousand, one hundred eleven".