13111311232221 has 16 divisors (see below), whose sum is σ = 17958070824384. Its totient is φ = 8502814024704.

The previous prime is 13111311232219. The next prime is 13111311232297. The reversal of 13111311232221 is 12223211311131.

It is not a de Polignac number, because 13111311232221 - 2¹ = 13111311232219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13111311232191 and 13111311232200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13111311232211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12119851 + ... + 13157256.

It is an arithmetic number, because the mean of its divisors is an integer number (1122379426524).

Almost surely, 2^{13111311232221} is an apocalyptic number.

It is an amenable number.

13111311232221 is a deficient number, since it is larger than the sum of its proper divisors (4846759592163).

13111311232221 is a wasteful number, since it uses less digits than its factorization.

13111311232221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25281820.

The product of its digits is 432, while the sum is 24.

Adding to 13111311232221 its reverse (12223211311131), we get a palindrome (25334522543352).

The spelling of 13111311232221 in words is "thirteen trillion, one hundred eleven billion, three hundred eleven million, two hundred thirty-two thousand, two hundred twenty-one".