1211112101111 has 32 divisors (see below), whose sum is σ = 1336414464000. Its totient is φ = 1088435918080.

The previous prime is 1211112101077. The next prime is 1211112101137. The reversal of 1211112101111 is 1111012111121.

It is a cyclic number.

It is not a de Polignac number, because 1211112101111 - 2¹⁰ = 1211112100087 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211112101911) 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, 260507915 + ... + 260512563.

It is an arithmetic number, because the mean of its divisors is an integer number (41762952000).

Almost surely, 2^{1211112101111} is an apocalyptic number.

1211112101111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1211112101111 is a deficient number, since it is larger than the sum of its proper divisors (125302362889).

1211112101111 is a wasteful number, since it uses less digits than its factorization.

1211112101111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5599.

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

Adding to 1211112101111 its reverse (1111012111121), we get a palindrome (2322124212232).

It can be divided in two parts, 121111 and 2101111, that added together give a palindrome (2222222).

The spelling of 1211112101111 in words is "one trillion, two hundred eleven billion, one hundred twelve million, one hundred one thousand, one hundred eleven".