1211121120111 has 16 divisors (see below), whose sum is σ = 1862765731584. Its totient is φ = 685601273664.

The previous prime is 1211121120103. The next prime is 1211121120149. The reversal of 1211121120111 is 1110211211121.

It is not a de Polignac number, because 1211121120111 - 2³ = 1211121120103 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211121120151) 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, 269495110 + ... + 269499603.

It is an arithmetic number, because the mean of its divisors is an integer number (116422858224).

Almost surely, 2^{1211121120111} is an apocalyptic number.

1211121120111 is a deficient number, since it is larger than the sum of its proper divisors (651644611473).

1211121120111 is a wasteful number, since it uses less digits than its factorization.

1211121120111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 538994830.

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 1211121120111 its reverse (1110211211121), we get a palindrome (2321332331232).

The spelling of 1211121120111 in words is "one trillion, two hundred eleven billion, one hundred twenty-one million, one hundred twenty thousand, one hundred eleven".