11211020211121 has 2 divisors, whose sum is σ = 11211020211122. Its totient is φ = 11211020211120.

The previous prime is 11211020211113. The next prime is 11211020211133. The reversal of 11211020211121 is 12111202011211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5840492057521 + 5370528153600 = 2416711^2 + 2317440^2 .

It is a cyclic number.

It is not a de Polignac number, because 11211020211121 - 2³ = 11211020211113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11211020211095 and 11211020211104.

It is not a weakly prime, because it can be changed into another prime (11211020211221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5605510105560 + 5605510105561.

It is an arithmetic number, because the mean of its divisors is an integer number (5605510105561).

Almost surely, 2^{11211020211121} is an apocalyptic number.

It is an amenable number.

11211020211121 is a deficient number, since it is larger than the sum of its proper divisors (1).

11211020211121 is an equidigital number, since it uses as much as digits as its factorization.

11211020211121 is an evil number, because the sum of its binary digits is even.

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

Adding to 11211020211121 its reverse (12111202011211), we get a palindrome (23322222222332).

The spelling of 11211020211121 in words is "eleven trillion, two hundred eleven billion, twenty million, two hundred eleven thousand, one hundred twenty-one".