201111121223123 has 2 divisors, whose sum is σ = 201111121223124. Its totient is φ = 201111121223122.

The previous prime is 201111121223119. The next prime is 201111121223143. The reversal of 201111121223123 is 321322121111102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 201111121223123 - 2² = 201111121223119 is a prime.

It is a super-3 number, since 3×201111121223123³ (a number of 44 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (201111121223143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100555560611561 + 100555560611562.

It is an arithmetic number, because the mean of its divisors is an integer number (100555560611562).

Almost surely, 2^{201111121223123} is an apocalyptic number.

201111121223123 is a deficient number, since it is larger than the sum of its proper divisors (1).

201111121223123 is an equidigital number, since it uses as much as digits as its factorization.

201111121223123 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 23.

Adding to 201111121223123 its reverse (321322121111102), we get a palindrome (522433242334225).

The spelling of 201111121223123 in words is "two hundred one trillion, one hundred eleven billion, one hundred twenty-one million, two hundred twenty-three thousand, one hundred twenty-three".