1201011211111 has 2 divisors, whose sum is σ = 1201011211112. Its totient is φ = 1201011211110.

The previous prime is 1201011211091. The next prime is 1201011211187. The reversal of 1201011211111 is 1111121101021.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1201011211111 - 2⁵ = 1201011211079 is a prime.

It is a super-3 number, since 3×1201011211111³ (a number of 37 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 1201011211091 and 1201011211100.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1201011511111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600505605555 + 600505605556.

It is an arithmetic number, because the mean of its divisors is an integer number (600505605556).

Almost surely, 2^{1201011211111} is an apocalyptic number.

1201011211111 is a deficient number, since it is larger than the sum of its proper divisors (1).

1201011211111 is an equidigital number, since it uses as much as digits as its factorization.

1201011211111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4, while the sum is 13.

Adding to 1201011211111 its reverse (1111121101021), we get a palindrome (2312132312132).

The spelling of 1201011211111 in words is "one trillion, two hundred one billion, eleven million, two hundred eleven thousand, one hundred eleven".