11121020221 has 4 divisors (see below), whose sum is σ = 11235670012. Its totient is φ = 11006370432.

The previous prime is 11121020201. The next prime is 11121020257. The reversal of 11121020221 is 12202012111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12202012111 = 103 ⋅118466137.

It can be written as a sum of positive squares in 2 ways, for example, as 5455447321 + 5665572900 = 73861^2 + 75270^2 .

It is a cyclic number.

It is not a de Polignac number, because 11121020221 - 2⁵ = 11121020189 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 (11121020201) 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, 57324750 + ... + 57324943.

It is an arithmetic number, because the mean of its divisors is an integer number (2808917503).

Almost surely, 2^11121020221 is an apocalyptic number.

It is an amenable number.

11121020221 is a deficient number, since it is larger than the sum of its proper divisors (114649791).

11121020221 is an equidigital number, since it uses as much as digits as its factorization.

11121020221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114649790.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 11121020221 its reverse (12202012111), we get a palindrome (23323032332).

The spelling of 11121020221 in words is "eleven billion, one hundred twenty-one million, twenty thousand, two hundred twenty-one".