11222121211221 has 4 divisors (see below), whose sum is σ = 14962828281632. Its totient is φ = 7481414140812.

The previous prime is 11222121211219. The next prime is 11222121211241. The reversal of 11222121211221 is 12211212122211.

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 not a de Polignac number, because 11222121211221 - 2¹ = 11222121211219 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 (11222121211211) 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, 1870353535201 + ... + 1870353535206.

It is an arithmetic number, because the mean of its divisors is an integer number (3740707070408).

Almost surely, 2^{11222121211221} is an apocalyptic number.

It is an amenable number.

11222121211221 is a deficient number, since it is larger than the sum of its proper divisors (3740707070411).

11222121211221 is an equidigital number, since it uses as much as digits as its factorization.

11222121211221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3740707070410.

The product of its digits is 128, while the sum is 21.

Adding to 11222121211221 its reverse (12211212122211), we get a palindrome (23433333333432).

The spelling of 11222121211221 in words is "eleven trillion, two hundred twenty-two billion, one hundred twenty-one million, two hundred eleven thousand, two hundred twenty-one".