1211121101121 has 64 divisors (see below), whose sum is σ = 1772221980672. Its totient is φ = 732578660352.

The previous prime is 1211121101119. The next prime is 1211121101213. The reversal of 1211121101121 is 1211011211121.

It is not a de Polignac number, because 1211121101121 - 2¹ = 1211121101119 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1211121101121.

It is not an unprimeable number, because it can be changed into a prime (1211121101111) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 205376245 + ... + 205382141.

It is an arithmetic number, because the mean of its divisors is an integer number (27690968448).

Almost surely, 2^{1211121101121} is an apocalyptic number.

It is an amenable number.

1211121101121 is a deficient number, since it is larger than the sum of its proper divisors (561100879551).

1211121101121 is a wasteful number, since it uses less digits than its factorization.

1211121101121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6938.

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

Adding to 1211121101121 its reverse (1211011211121), we get a palindrome (2422132312242).

The spelling of 1211121101121 in words is "one trillion, two hundred eleven billion, one hundred twenty-one million, one hundred one thousand, one hundred twenty-one".