1200001211111 has 8 divisors (see below), whose sum is σ = 1214482671360. Its totient is φ = 1185520313272.

The previous prime is 1200001211089. The next prime is 1200001211113. The reversal of 1200001211111 is 1111121000021.

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

It is a cyclic number.

It is not a de Polignac number, because 1200001211111 - 2¹⁴ = 1200001194727 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1200001211092 and 1200001211101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200001211113) 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 in 7 ways as a sum of consecutive naturals, for example, 5517650 + ... + 5731008.

It is an arithmetic number, because the mean of its divisors is an integer number (151810333920).

Almost surely, 2^{1200001211111} is an apocalyptic number.

1200001211111 is a deficient number, since it is larger than the sum of its proper divisors (14481460249).

1200001211111 is an equidigital number, since it uses as much as digits as its factorization.

1200001211111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281205.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 1200001211111 its reverse (1111121000021), we get a palindrome (2311122211132).

The spelling of 1200001211111 in words is "one trillion, two hundred billion, one million, two hundred eleven thousand, one hundred eleven".