11211202121111 has 8 divisors (see below), whose sum is σ = 11364429250944. Its totient is φ = 11058999922360.

The previous prime is 11211202121107. The next prime is 11211202121143. The reversal of 11211202121111 is 11112120211211.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11211202121111 - 2² = 11211202121107 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 11211202121111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11211202151111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 256210745 + ... + 256254498.

It is an arithmetic number, because the mean of its divisors is an integer number (1420553656368).

Almost surely, 2^{11211202121111} is an apocalyptic number.

11211202121111 is a deficient number, since it is larger than the sum of its proper divisors (153227129833).

11211202121111 is a wasteful number, since it uses less digits than its factorization.

11211202121111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 512465541.

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

Adding to 11211202121111 its reverse (11112120211211), we get a palindrome (22323322332322).

The spelling of 11211202121111 in words is "eleven trillion, two hundred eleven billion, two hundred two million, one hundred twenty-one thousand, one hundred eleven".