13111213421 has 4 divisors (see below), whose sum is σ = 13136972700. Its totient is φ = 13085454144.

The previous prime is 13111213343. The next prime is 13111213459. The reversal of 13111213421 is 12431211131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12431211131 = 41357 ⋅300583.

It can be written as a sum of positive squares in 2 ways, for example, as 8275540900 + 4835672521 = 90970^2 + 69539^2 .

It is a cyclic number.

It is not a de Polignac number, because 13111213421 - 2¹⁸ = 13110951277 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13111213393 and 13111213402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13111213481) 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, 12878876 + ... + 12879893.

It is an arithmetic number, because the mean of its divisors is an integer number (3284243175).

Almost surely, 2^13111213421 is an apocalyptic number.

It is an amenable number.

13111213421 is a deficient number, since it is larger than the sum of its proper divisors (25759279).

13111213421 is an equidigital number, since it uses as much as digits as its factorization.

13111213421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25759278.

The product of its digits is 144, while the sum is 20.

Adding to 13111213421 its reverse (12431211131), we get a palindrome (25542424552).

The spelling of 13111213421 in words is "thirteen billion, one hundred eleven million, two hundred thirteen thousand, four hundred twenty-one".