13111232221221 has 4 divisors (see below), whose sum is σ = 17481642961632. Its totient is φ = 8740821480812.

The previous prime is 13111232221177. The next prime is 13111232221279. The reversal of 13111232221221 is 12212223211131.

13111232221221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 13111232221221 - 2¹⁷ = 13111232090149 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13111232221191 and 13111232221200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13111232221721) 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, 2185205370201 + ... + 2185205370206.

It is an arithmetic number, because the mean of its divisors is an integer number (4370410740408).

Almost surely, 2^{13111232221221} is an apocalyptic number.

It is an amenable number.

13111232221221 is a deficient number, since it is larger than the sum of its proper divisors (4370410740411).

13111232221221 is an equidigital number, since it uses as much as digits as its factorization.

13111232221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4370410740410.

The product of its digits is 576, while the sum is 24.

Adding to 13111232221221 its reverse (12212223211131), we get a palindrome (25323455432352).

The spelling of 13111232221221 in words is "thirteen trillion, one hundred eleven billion, two hundred thirty-two million, two hundred twenty-one thousand, two hundred twenty-one".