11211221010221 has 4 divisors (see below), whose sum is σ = 11212349931744. Its totient is φ = 11210092088700.

The previous prime is 11211221010211. The next prime is 11211221010271. The reversal of 11211221010221 is 12201012211211.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11211221010221 - 2¹⁴ = 11211220993837 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11211221010221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11211221010211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 564445865 + ... + 564465726.

It is an arithmetic number, because the mean of its divisors is an integer number (2803087482936).

Almost surely, 2^{11211221010221} is an apocalyptic number.

It is an amenable number.

11211221010221 is a deficient number, since it is larger than the sum of its proper divisors (1128921523).

11211221010221 is an equidigital number, since it uses as much as digits as its factorization.

11211221010221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1128921522.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 11211221010221 its reverse (12201012211211), we get a palindrome (23412233221432).

The spelling of 11211221010221 in words is "eleven trillion, two hundred eleven billion, two hundred twenty-one million, ten thousand, two hundred twenty-one".