1200111211111 has 2 divisors, whose sum is σ = 1200111211112. Its totient is φ = 1200111211110.

The previous prime is 1200111211099. The next prime is 1200111211133. The reversal of 1200111211111 is 1111121110021.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1200111211111 - 2³⁷ = 1062672257639 is a prime.

It is a super-2 number, since 2×1200111211111² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1200111211091 and 1200111211100.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1200111211181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600055605555 + 600055605556.

It is an arithmetic number, because the mean of its divisors is an integer number (600055605556).

Almost surely, 2^{1200111211111} is an apocalyptic number.

1200111211111 is a deficient number, since it is larger than the sum of its proper divisors (1).

1200111211111 is an equidigital number, since it uses as much as digits as its factorization.

1200111211111 is an evil number, because the sum of its binary digits is even.

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

Adding to 1200111211111 its reverse (1111121110021), we get a palindrome (2311232321132).

The spelling of 1200111211111 in words is "one trillion, two hundred billion, one hundred eleven million, two hundred eleven thousand, one hundred eleven".