13111210021220 has 12 divisors (see below), whose sum is σ = 27533541044604. Its totient is φ = 5244484008480.

The previous prime is 13111210021187. The next prime is 13111210021229. The reversal of 13111210021220 is 2212001211131.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 7290561610816 + 5820648410404 = 2700104^2 + 2412602^2 .

It is not an unprimeable number, because it can be changed into a prime (13111210021229) 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, 327780250511 + ... + 327780250550.

It is an arithmetic number, because the mean of its divisors is an integer number (2294461753717).

Almost surely, 2^{13111210021220} is an apocalyptic number.

13111210021220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13111210021220 is an abundant number, since it is smaller than the sum of its proper divisors (14422331023384).

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

13111210021220 is a wasteful number, since it uses less digits than its factorization.

13111210021220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 655560501070 (or 655560501068 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 13111210021220 its reverse (2212001211131), we get a palindrome (15323211232351).

The spelling of 13111210021220 in words is "thirteen trillion, one hundred eleven billion, two hundred ten million, twenty-one thousand, two hundred twenty".