1211111012111 has 32 divisors (see below), whose sum is σ = 1626257192448. Its totient is φ = 871048391040.

The previous prime is 1211111012099. The next prime is 1211111012147. The reversal of 1211111012111 is 1112101111121.

It is a cyclic number.

It is not a de Polignac number, because 1211111012111 - 2³⁸ = 936233105167 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211111002111) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12119396 + ... + 12218918.

It is an arithmetic number, because the mean of its divisors is an integer number (50820537264).

Almost surely, 2^{1211111012111} is an apocalyptic number.

1211111012111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1211111012111 is a deficient number, since it is larger than the sum of its proper divisors (415146180337).

1211111012111 is a wasteful number, since it uses less digits than its factorization.

1211111012111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111711.

The product of its (nonzero) digits is 4, while the sum is 14.

Adding to 1211111012111 its reverse (1112101111121), we get a palindrome (2323212123232).

The spelling of 1211111012111 in words is "one trillion, two hundred eleven billion, one hundred eleven million, twelve thousand, one hundred eleven".