11121233111221 has 8 divisors (see below), whose sum is σ = 11775631946904. Its totient is φ = 10466857459200.

The previous prime is 11121233111213. The next prime is 11121233111237. The reversal of 11121233111221 is 12211133212111.

It can be written as a sum of positive squares in 4 ways, for example, as 1192343883025 + 9928889228196 = 1091945^2 + 3151014^2 .

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

It is not a de Polignac number, because 11121233111221 - 2³ = 11121233111213 is a prime.

It is a super-2 number, since 2×11121233111221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11121233111192 and 11121233111201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11121233111281) 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, 4803430 + ... + 6731671.

It is an arithmetic number, because the mean of its divisors is an integer number (1471953993363).

Almost surely, 2^{11121233111221} is an apocalyptic number.

It is an amenable number.

11121233111221 is a deficient number, since it is larger than the sum of its proper divisors (654398835683).

11121233111221 is a wasteful number, since it uses less digits than its factorization.

11121233111221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11591831.

The product of its digits is 144, while the sum is 22.

Adding to 11121233111221 its reverse (12211133212111), we get a palindrome (23332366323332).

The spelling of 11121233111221 in words is "eleven trillion, one hundred twenty-one billion, two hundred thirty-three million, one hundred eleven thousand, two hundred twenty-one".