11020111121 has 4 divisors (see below), whose sum is σ = 11133720612. Its totient is φ = 10906501632.

The previous prime is 11020111087. The next prime is 11020111129. The reversal of 11020111121 is 12111102011.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1906544896 + 9113566225 = 43664^2 + 95465^2 .

It is a cyclic number.

It is not a de Polignac number, because 11020111121 - 2⁶ = 11020111057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11020111129) 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, 56804600 + ... + 56804793.

It is an arithmetic number, because the mean of its divisors is an integer number (2783430153).

Almost surely, 2^11020111121 is an apocalyptic number.

It is an amenable number.

11020111121 is a deficient number, since it is larger than the sum of its proper divisors (113609491).

11020111121 is an equidigital number, since it uses as much as digits as its factorization.

11020111121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113609490.

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

Adding to 11020111121 its reverse (12111102011), we get a palindrome (23131213132).

The spelling of 11020111121 in words is "eleven billion, twenty million, one hundred eleven thousand, one hundred twenty-one".