11011111202221 has 4 divisors (see below), whose sum is σ = 11858119756252. Its totient is φ = 10164102648192.

The previous prime is 11011111202207. The next prime is 11011111202251. The reversal of 11011111202221 is 12220211111011.

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 1438188570025 + 9572922632196 = 1199245^2 + 3094014^2 .

It is a cyclic number.

It is not a de Polignac number, because 11011111202221 - 2²⁵ = 11011077647789 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11011111202195 and 11011111202204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11011111202251) 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, 423504276996 + ... + 423504277021.

It is an arithmetic number, because the mean of its divisors is an integer number (2964529939063).

Almost surely, 2^{11011111202221} is an apocalyptic number.

It is an amenable number.

11011111202221 is a deficient number, since it is larger than the sum of its proper divisors (847008554031).

11011111202221 is an equidigital number, since it uses as much as digits as its factorization.

11011111202221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 847008554030.

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

Adding to 11011111202221 its reverse (12220211111011), we get a palindrome (23231322313232).

The spelling of 11011111202221 in words is "eleven trillion, eleven billion, one hundred eleven million, two hundred two thousand, two hundred twenty-one".