13122215643 has 4 divisors (see below), whose sum is σ = 17496287528. Its totient is φ = 8748143760.

The previous prime is 13122215633. The next prime is 13122215671. The reversal of 13122215643 is 34651222131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34651222131 = 3 ⋅11550407377.

It is not a de Polignac number, because 13122215643 - 2⁵ = 13122215611 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13122215643.

It is not an unprimeable number, because it can be changed into a prime (13122215633) 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, 2187035938 + ... + 2187035943.

It is an arithmetic number, because the mean of its divisors is an integer number (4374071882).

Almost surely, 2^13122215643 is an apocalyptic number.

13122215643 is a deficient number, since it is larger than the sum of its proper divisors (4374071885).

13122215643 is an equidigital number, since it uses as much as digits as its factorization.

13122215643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4374071884.

The product of its digits is 8640, while the sum is 30.

Adding to 13122215643 its reverse (34651222131), we get a palindrome (47773437774).

The spelling of 13122215643 in words is "thirteen billion, one hundred twenty-two million, two hundred fifteen thousand, six hundred forty-three".