11123310131221 has 4 divisors (see below), whose sum is σ = 11197963219500. Its totient is φ = 11048657042944.

The previous prime is 11123310131159. The next prime is 11123310131231. The reversal of 11123310131221 is 12213101332111.

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 1236599600625 + 9886710530596 = 1112025^2 + 3144314^2 .

It is a cyclic number.

It is not a de Polignac number, because 11123310131221 - 2⁷ = 11123310131093 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11123310131192 and 11123310131201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11123310131231) 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, 37326543916 + ... + 37326544213.

It is an arithmetic number, because the mean of its divisors is an integer number (2799490804875).

Almost surely, 2^{11123310131221} is an apocalyptic number.

It is an amenable number.

11123310131221 is a deficient number, since it is larger than the sum of its proper divisors (74653088279).

11123310131221 is an equidigital number, since it uses as much as digits as its factorization.

11123310131221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74653088278.

The product of its (nonzero) digits is 216, while the sum is 22.

Adding to 11123310131221 its reverse (12213101332111), we get a palindrome (23336411463332).

The spelling of 11123310131221 in words is "eleven trillion, one hundred twenty-three billion, three hundred ten million, one hundred thirty-one thousand, two hundred twenty-one".