11020121111 has 2 divisors, whose sum is σ = 11020121112. Its totient is φ = 11020121110.

The previous prime is 11020121059. The next prime is 11020121137. The reversal of 11020121111 is 11112102011.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11020121111 - 2¹⁰ = 11020120087 is a prime.

It is a super-4 number, since 4×11020121111⁴ (a number of 41 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 11020121092 and 11020121101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11020121611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5510060555 + 5510060556.

It is an arithmetic number, because the mean of its divisors is an integer number (5510060556).

Almost surely, 2^11020121111 is an apocalyptic number.

11020121111 is a deficient number, since it is larger than the sum of its proper divisors (1).

11020121111 is an equidigital number, since it uses as much as digits as its factorization.

11020121111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 11020121111 its reverse (11112102011), we get a palindrome (22132223122).

The spelling of 11020121111 in words is "eleven billion, twenty million, one hundred twenty-one thousand, one hundred eleven".