1111211220120 has 128 divisors (see below), whose sum is σ = 3449488032000. Its totient is φ = 286030169600.

The previous prime is 1111211220089. The next prime is 1111211220131. The reversal of 1111211220120 is 210221121111.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 1111211220120.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13946395 + ... + 14025845.

It is an arithmetic number, because the mean of its divisors is an integer number (26949125250).

Almost surely, 2^{1111211220120} is an apocalyptic number.

1111211220120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1111211220120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1724744016000).

1111211220120 is an abundant number, since it is smaller than the sum of its proper divisors (2338276811880).

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

1111211220120 is a wasteful number, since it uses less digits than its factorization.

1111211220120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83513 (or 83509 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 1111211220120 its reverse (210221121111), we get a palindrome (1321432341231).

Subtracting from 1111211220120 its reverse (210221121111), we obtain a palindrome (900990099009).

It can be divided in two parts, 1111211 and 220120, that added together give a palindrome (1331331).

The spelling of 1111211220120 in words is "one trillion, one hundred eleven billion, two hundred eleven million, two hundred twenty thousand, one hundred twenty".