11222112021221 has 4 divisors (see below), whose sum is σ = 11222181058092. Its totient is φ = 11222042984352.

The previous prime is 11222112021217. The next prime is 11222112021223. The reversal of 11222112021221 is 12212021122211.

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 811900113025 + 10410211908196 = 901055^2 + 3226486^2 .

It is a cyclic number.

It is not a de Polignac number, because 11222112021221 - 2² = 11222112021217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11222112021193 and 11222112021202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11222112021223) 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, 34274030 + ... + 34599903.

It is an arithmetic number, because the mean of its divisors is an integer number (2805545264523).

Almost surely, 2^{11222112021221} is an apocalyptic number.

It is an amenable number.

11222112021221 is a deficient number, since it is larger than the sum of its proper divisors (69036871).

11222112021221 is an equidigital number, since it uses as much as digits as its factorization.

11222112021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69036870.

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

Adding to 11222112021221 its reverse (12212021122211), we get a palindrome (23434133143432).

The spelling of 11222112021221 in words is "eleven trillion, two hundred twenty-two billion, one hundred twelve million, twenty-one thousand, two hundred twenty-one".