201231011111 has 8 divisors (see below), whose sum is σ = 218814304800. Its totient is φ = 183948286752.

The previous prime is 201231011101. The next prime is 201231011167. The reversal of 201231011111 is 111110132102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201231011111 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201231011101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75140936 + ... + 75143613.

It is an arithmetic number, because the mean of its divisors is an integer number (27351788100).

Almost surely, 2^201231011111 is an apocalyptic number.

201231011111 is a deficient number, since it is larger than the sum of its proper divisors (17583293689).

201231011111 is a wasteful number, since it uses less digits than its factorization.

201231011111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150284665.

The product of its (nonzero) digits is 12, while the sum is 14.

Adding to 201231011111 its reverse (111110132102), we get a palindrome (312341143213).

The spelling of 201231011111 in words is "two hundred one billion, two hundred thirty-one million, eleven thousand, one hundred eleven".