13111111321220 has 48 divisors (see below), whose sum is σ = 30037512657600. Its totient is φ = 4767494536320.

The previous prime is 13111111321193. The next prime is 13111111321283. The reversal of 13111111321220 is 2212311111131.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 13111111321192 and 13111111321201.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4694786 + ... + 6947174.

It is an arithmetic number, because the mean of its divisors is an integer number (625781513700).

Almost surely, 2^{13111111321220} is an apocalyptic number.

13111111321220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13111111321220 is an abundant number, since it is smaller than the sum of its proper divisors (16926401336380).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13111111321220 is a wasteful number, since it uses less digits than its factorization.

13111111321220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2278868 (or 2278866 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 20.

Adding to 13111111321220 its reverse (2212311111131), we get a palindrome (15323422432351).

The spelling of 13111111321220 in words is "thirteen trillion, one hundred eleven billion, one hundred eleven million, three hundred twenty-one thousand, two hundred twenty".