1211000111111 has 8 divisors (see below), whose sum is σ = 1384498528800. Its totient is φ = 1037626293888.

The previous prime is 1211000111093. The next prime is 1211000111171. The reversal of 1211000111111 is 1111110001121.

It is a happy number.

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 1211000111111 - 2¹⁰ = 1211000110087 is a prime.

It is a super-2 number, since 2×1211000111111² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1211000111092 and 1211000111101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211000111171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31129286 + ... + 31168163.

It is an arithmetic number, because the mean of its divisors is an integer number (173062316100).

Almost surely, 2^{1211000111111} is an apocalyptic number.

1211000111111 is a deficient number, since it is larger than the sum of its proper divisors (173498417689).

1211000111111 is an equidigital number, since it uses as much as digits as its factorization.

1211000111111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62300233.

The product of its (nonzero) digits is 2, while the sum is 11.

Adding to 1211000111111 its reverse (1111110001121), we get a palindrome (2322110112232).

The spelling of 1211000111111 in words is "one trillion, two hundred eleven billion, one hundred eleven thousand, one hundred eleven".