11113213331221 has 4 divisors (see below), whose sum is σ = 11113298471500. Its totient is φ = 11113128190944.

The previous prime is 11113213331203. The next prime is 11113213331239. The reversal of 11113213331221 is 12213331231111.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (11113213331203) and next prime (11113213331239).

It can be written as a sum of positive squares in 2 ways, for example, as 9672939718225 + 1440273612996 = 3110135^2 + 1200114^2 .

It is a cyclic number.

It is not a de Polignac number, because 11113213331221 - 2²⁹ = 11112676460309 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 (11113213331321) 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, 42374046 + ... + 42635503.

It is an arithmetic number, because the mean of its divisors is an integer number (2778324617875).

Almost surely, 2^{11113213331221} is an apocalyptic number.

It is an amenable number.

11113213331221 is a deficient number, since it is larger than the sum of its proper divisors (85140279).

11113213331221 is an equidigital number, since it uses as much as digits as its factorization.

11113213331221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85140278.

The product of its digits is 648, while the sum is 25.

Adding to 11113213331221 its reverse (12213331231111), we get a palindrome (23326544562332).

The spelling of 11113213331221 in words is "eleven trillion, one hundred thirteen billion, two hundred thirteen million, three hundred thirty-one thousand, two hundred twenty-one".