11212210112221 has 4 divisors (see below), whose sum is σ = 11232935085244. Its totient is φ = 11191485139200.

The previous prime is 11212210112197. The next prime is 11212210112267. The reversal of 11212210112221 is 12221101221211.

It is a happy number.

11212210112221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 2406236952025 + 8805973160196 = 1551205^2 + 2967486^2 .

It is a cyclic number.

It is not a de Polignac number, because 11212210112221 - 2³¹ = 11210062628573 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 (11612210112221) 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, 10362485700 + ... + 10362486781.

It is an arithmetic number, because the mean of its divisors is an integer number (2808233771311).

Almost surely, 2^{11212210112221} is an apocalyptic number.

It is an amenable number.

11212210112221 is a deficient number, since it is larger than the sum of its proper divisors (20724973023).

11212210112221 is an equidigital number, since it uses as much as digits as its factorization.

11212210112221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20724973022.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 11212210112221 its reverse (12221101221211), we get a palindrome (23433311333432).

The spelling of 11212210112221 in words is "eleven trillion, two hundred twelve billion, two hundred ten million, one hundred twelve thousand, two hundred twenty-one".