13111222322221 has 4 divisors (see below), whose sum is σ = 13111319637052. Its totient is φ = 13111125007392.

The previous prime is 13111222322213. The next prime is 13111222322251. The reversal of 13111222322221 is 12222322211131.

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 10763248386121 + 2347973936100 = 3280739^2 + 1532310^2 .

It is a cyclic number.

It is not a de Polignac number, because 13111222322221 - 2³ = 13111222322213 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 (13111222322251) 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, 48455040 + ... + 48724873.

It is an arithmetic number, because the mean of its divisors is an integer number (3277829909263).

Almost surely, 2^{13111222322221} is an apocalyptic number.

It is an amenable number.

13111222322221 is a deficient number, since it is larger than the sum of its proper divisors (97314831).

13111222322221 is an equidigital number, since it uses as much as digits as its factorization.

13111222322221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97314830.

The product of its digits is 1152, while the sum is 25.

Adding to 13111222322221 its reverse (12222322211131), we get a palindrome (25333544533352).

The spelling of 13111222322221 in words is "thirteen trillion, one hundred eleven billion, two hundred twenty-two million, three hundred twenty-two thousand, two hundred twenty-one".