1211122110121 has 16 divisors (see below), whose sum is σ = 1524920635008. Its totient is φ = 934387632000.

The previous prime is 1211122110089. The next prime is 1211122110137. The reversal of 1211122110121 is 1210112211121.

It is a cyclic number.

It is not a de Polignac number, because 1211122110121 - 2⁵ = 1211122110089 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1211122110095 and 1211122110104.

It is not an unprimeable number, because it can be changed into a prime (1211122110181) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77857860 + ... + 77873413.

It is an arithmetic number, because the mean of its divisors is an integer number (95307539688).

Almost surely, 2^{1211122110121} is an apocalyptic number.

1211122110121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1211122110121 is a deficient number, since it is larger than the sum of its proper divisors (313798524887).

1211122110121 is a wasteful number, since it uses less digits than its factorization.

1211122110121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155731392.

The product of its (nonzero) digits is 16, while the sum is 16.

Adding to 1211122110121 its reverse (1210112211121), we get a palindrome (2421234321242).

The spelling of 1211122110121 in words is "one trillion, two hundred eleven billion, one hundred twenty-two million, one hundred ten thousand, one hundred twenty-one".