1211110111121 has 4 divisors (see below), whose sum is σ = 1231637401200. Its totient is φ = 1190582821044.

The previous prime is 1211110111111. The next prime is 1211110111147.

1211110111121 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1211110111121 - 2²² = 1211105916817 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1211110111096 and 1211110111105.

It is not an unprimeable number, because it can be changed into a prime (1211110111111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10263644951 + ... + 10263645068.

It is an arithmetic number, because the mean of its divisors is an integer number (307909350300).

Almost surely, 2^{1211110111121} is an apocalyptic number.

It is an amenable number.

1211110111121 is a deficient number, since it is larger than the sum of its proper divisors (20527290079).

1211110111121 is an equidigital number, since it uses as much as digits as its factorization.

1211110111121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20527290078.

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

It can be divided in two parts, 1211110 and 111121, that added together give a palindrome (1322231).

The spelling of 1211110111121 in words is "one trillion, two hundred eleven billion, one hundred ten million, one hundred eleven thousand, one hundred twenty-one".