11212201211221 has 8 divisors (see below), whose sum is σ = 11216807063000. Its totient is φ = 11207595974400.

The previous prime is 11212201211203. The next prime is 11212201211251. The reversal of 11212201211221 is 12211210221211.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 317673140625 + 10894528070596 = 563625^2 + 3300686^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11212201211221 - 2¹¹ = 11212201209173 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 (11212201211201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38274535 + ... + 38566363.

It is an arithmetic number, because the mean of its divisors is an integer number (1402100882875).

Almost surely, 2^{11212201211221} is an apocalyptic number.

It is an amenable number.

11212201211221 is a deficient number, since it is larger than the sum of its proper divisors (4605851779).

11212201211221 is a wasteful number, since it uses less digits than its factorization.

11212201211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307479.

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

Adding to 11212201211221 its reverse (12211210221211), we get a palindrome (23423411432432).

The spelling of 11212201211221 in words is "eleven trillion, two hundred twelve billion, two hundred one million, two hundred eleven thousand, two hundred twenty-one".