11211122101121 has 4 divisors (see below), whose sum is σ = 11243245660500. Its totient is φ = 11178998541744.

The previous prime is 11211122101111. The next prime is 11211122101139. The reversal of 11211122101121 is 12110122111211.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3163546020496 + 8047576080625 = 1778636^2 + 2836825^2 .

It is a cyclic number.

It is not a de Polignac number, because 11211122101121 - 2¹⁸ = 11211121838977 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11211122101121.

It is not an unprimeable number, because it can be changed into a prime (11211122101111) 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, 16061779166 + ... + 16061779863.

It is an arithmetic number, because the mean of its divisors is an integer number (2810811415125).

Almost surely, 2^{11211122101121} is an apocalyptic number.

It is an amenable number.

11211122101121 is a deficient number, since it is larger than the sum of its proper divisors (32123559379).

11211122101121 is an equidigital number, since it uses as much as digits as its factorization.

11211122101121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32123559378.

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 11211122101121 its reverse (12110122111211), we get a palindrome (23321244212332).

The spelling of 11211122101121 in words is "eleven trillion, two hundred eleven billion, one hundred twenty-two million, one hundred one thousand, one hundred twenty-one".