11111220101 has 4 divisors (see below), whose sum is σ = 11121349932. Its totient is φ = 11101090272.

The previous prime is 11111220073. The next prime is 11111220161. The reversal of 11111220101 is 10102211111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10102211111 = 229 ⋅44114459.

It can be written as a sum of positive squares in 2 ways, for example, as 1181296900 + 9929923201 = 34370^2 + 99649^2 .

It is a cyclic number.

It is not a de Polignac number, because 11111220101 - 2⁶ = 11111220037 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11111220161) 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, 5063270 + ... + 5065463.

It is an arithmetic number, because the mean of its divisors is an integer number (2780337483).

Almost surely, 2^11111220101 is an apocalyptic number.

It is an amenable number.

11111220101 is a deficient number, since it is larger than the sum of its proper divisors (10129831).

11111220101 is a wasteful number, since it uses less digits than its factorization.

11111220101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10129830.

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

Adding to 11111220101 its reverse (10102211111), we get a palindrome (21213431212).

The spelling of 11111220101 in words is "eleven billion, one hundred eleven million, two hundred twenty thousand, one hundred one".