11222110221221 has 4 divisors (see below), whose sum is σ = 11375837758572. Its totient is φ = 11068382683872.

The previous prime is 11222110221199. The next prime is 11222110221317. The reversal of 11222110221221 is 12212201122211.

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 4500172492321 + 6721937728900 = 2121361^2 + 2592670^2 .

It is a cyclic number.

It is not a de Polignac number, because 11222110221221 - 2²² = 11222106026917 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 11222110221193 and 11222110221202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11222110221521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76863768566 + ... + 76863768711.

It is an arithmetic number, because the mean of its divisors is an integer number (2843959439643).

Almost surely, 2^{11222110221221} is an apocalyptic number.

It is an amenable number.

11222110221221 is a deficient number, since it is larger than the sum of its proper divisors (153727537351).

11222110221221 is an equidigital number, since it uses as much as digits as its factorization.

11222110221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153727537350.

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

Adding to 11222110221221 its reverse (12212201122211), we get a palindrome (23434311343432).

The spelling of 11222110221221 in words is "eleven trillion, two hundred twenty-two billion, one hundred ten million, two hundred twenty-one thousand, two hundred twenty-one".