11220120221 has 4 divisors (see below), whose sum is σ = 11373820572. Its totient is φ = 11066419872.

The previous prime is 11220120143. The next prime is 11220120251. The reversal of 11220120221 is 12202102211.

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 2653692196 + 8566428025 = 51514^2 + 92555^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11220120221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11220120196 and 11220120205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11220120251) 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, 76850066 + ... + 76850211.

It is an arithmetic number, because the mean of its divisors is an integer number (2843455143).

Almost surely, 2^11220120221 is an apocalyptic number.

It is an amenable number.

11220120221 is a deficient number, since it is larger than the sum of its proper divisors (153700351).

11220120221 is an equidigital number, since it uses as much as digits as its factorization.

11220120221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153700350.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 11220120221 its reverse (12202102211), we get a palindrome (23422222432).

The spelling of 11220120221 in words is "eleven billion, two hundred twenty million, one hundred twenty thousand, two hundred twenty-one".