13220211161 has 4 divisors (see below), whose sum is σ = 13221021492. Its totient is φ = 13219400832.

The previous prime is 13220211133. The next prime is 13220211163. The reversal of 13220211161 is 16111202231.

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 7364900761 + 5855310400 = 85819^2 + 76520^2 .

It is a cyclic number.

It is not a de Polignac number, because 13220211161 - 2⁶ = 13220211097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13220211163) 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, 380180 + ... + 413493.

It is an arithmetic number, because the mean of its divisors is an integer number (3305255373).

Almost surely, 2^13220211161 is an apocalyptic number.

It is an amenable number.

13220211161 is a deficient number, since it is larger than the sum of its proper divisors (810331).

13220211161 is an equidigital number, since it uses as much as digits as its factorization.

13220211161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 810330.

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

Adding to 13220211161 its reverse (16111202231), we get a palindrome (29331413392).

The spelling of 13220211161 in words is "thirteen billion, two hundred twenty million, two hundred eleven thousand, one hundred sixty-one".