1111111212120 has 512 divisors, whose sum is σ = 4435235481600. Its totient is φ = 216089690112.

The previous prime is 1111111212097. The next prime is 1111111212137. The reversal of 1111111212120 is 212121111111.

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 1111111212120.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 7604392 + ... + 7749128.

It is an arithmetic number, because the mean of its divisors is an integer number (8662569300).

Almost surely, 2^{1111111212120} is an apocalyptic number.

1111111212120 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 1111111212120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2217617740800).

1111111212120 is an abundant number, since it is smaller than the sum of its proper divisors (3324124269480).

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

1111111212120 is a wasteful number, since it uses less digits than its factorization.

1111111212120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144827 (or 144823 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 1111111212120 its reverse (212121111111), we get a palindrome (1323232323231).

It can be divided in two parts, 1111111 and 212120, that added together give a palindrome (1323231).

The spelling of 1111111212120 in words is "one trillion, one hundred eleven billion, one hundred eleven million, two hundred twelve thousand, one hundred twenty".