11201211202121 has 2 divisors, whose sum is σ = 11201211202122. Its totient is φ = 11201211202120.

The previous prime is 11201211202099. The next prime is 11201211202151. The reversal of 11201211202121 is 12120211210211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9065302026496 + 2135909175625 = 3010864^2 + 1461475^2 .

It is a cyclic number.

It is not a de Polignac number, because 11201211202121 - 2³⁴ = 11184031332937 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11201211202121.

It is not a weakly prime, because it can be changed into another prime (11201211202151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5600605601060 + 5600605601061.

It is an arithmetic number, because the mean of its divisors is an integer number (5600605601061).

Almost surely, 2^{11201211202121} is an apocalyptic number.

It is an amenable number.

11201211202121 is a deficient number, since it is larger than the sum of its proper divisors (1).

11201211202121 is an equidigital number, since it uses as much as digits as its factorization.

11201211202121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 11201211202121 its reverse (12120211210211), we get a palindrome (23321422412332).

The spelling of 11201211202121 in words is "eleven trillion, two hundred one billion, two hundred eleven million, two hundred two thousand, one hundred twenty-one".