1211200001111 has 2 divisors, whose sum is σ = 1211200001112. Its totient is φ = 1211200001110.

The previous prime is 1211200001029. The next prime is 1211200001171. The reversal of 1211200001111 is 1111000021121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1211200001111 - 2²⁶ = 1211132892247 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 1211200001092 and 1211200001101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1211200001171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605600000555 + 605600000556.

It is an arithmetic number, because the mean of its divisors is an integer number (605600000556).

Almost surely, 2^{1211200001111} is an apocalyptic number.

1211200001111 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211200001111 is an equidigital number, since it uses as much as digits as its factorization.

1211200001111 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 11.

Adding to 1211200001111 its reverse (1111000021121), we get a palindrome (2322200022232).

The spelling of 1211200001111 in words is "one trillion, two hundred eleven billion, two hundred million, one thousand, one hundred eleven".