11201211121211 has 4 divisors (see below), whose sum is σ = 11204884857000. Its totient is φ = 11197537385424.

The previous prime is 11201211121207. The next prime is 11201211121231. The reversal of 11201211121211 is 11212111210211.

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

It is a cyclic number.

It is not a de Polignac number, because 11201211121211 - 2² = 11201211121207 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 11201211121211.

It is not an unprimeable number, because it can be changed into a prime (11201211121231) 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, 1836863321 + ... + 1836869418.

It is an arithmetic number, because the mean of its divisors is an integer number (2801221214250).

Almost surely, 2^{11201211121211} is an apocalyptic number.

11201211121211 is a deficient number, since it is larger than the sum of its proper divisors (3673735789).

11201211121211 is an equidigital number, since it uses as much as digits as its factorization.

11201211121211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3673735788.

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

Adding to 11201211121211 its reverse (11212111210211), we get a palindrome (22413322331422).

The spelling of 11201211121211 in words is "eleven trillion, two hundred one billion, two hundred eleven million, one hundred twenty-one thousand, two hundred eleven".