11201222112221 has 4 divisors (see below), whose sum is σ = 11206831138812. Its totient is φ = 11195613085632.

The previous prime is 11201222112209. The next prime is 11201222112247. The reversal of 11201222112221 is 12221122210211.

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 122216664025 + 11079005448196 = 349595^2 + 3328514^2 .

It is a cyclic number.

It is not a de Polignac number, because 11201222112221 - 2²² = 11201217917917 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11201222112193 and 11201222112202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11201222112251) 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, 2804510300 + ... + 2804514293.

It is an arithmetic number, because the mean of its divisors is an integer number (2801707784703).

Almost surely, 2^{11201222112221} is an apocalyptic number.

It is an amenable number.

11201222112221 is a deficient number, since it is larger than the sum of its proper divisors (5609026591).

11201222112221 is an equidigital number, since it uses as much as digits as its factorization.

11201222112221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5609026590.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 11201222112221 its reverse (12221122210211), we get a palindrome (23422344322432).

The spelling of 11201222112221 in words is "eleven trillion, two hundred one billion, two hundred twenty-two million, one hundred twelve thousand, two hundred twenty-one".