1111212120 has 128 divisors (see below), whose sum is σ = 3457209600. Its totient is φ = 285497856.

The previous prime is 1111212119. The next prime is 1111212121. The reversal of 1111212120 is 212121111.

It is an interprime number because it is at equal distance from previous prime (1111212119) and next prime (1111212121).

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 1111212096 and 1111212105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1111212121) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 473911 + ... + 476249.

It is an arithmetic number, because the mean of its divisors is an integer number (27009450).

Almost surely, 2^1111212120 is an apocalyptic number.

1111212120 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 1111212120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1728604800).

1111212120 is an abundant number, since it is smaller than the sum of its proper divisors (2345997480).

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

1111212120 is a wasteful number, since it uses less digits than its factorization.

1111212120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2497 (or 2493 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

The square root of 1111212120 is about 33334.8484322338. The cubic root of 1111212120 is about 1035.7755535106.

Adding to 1111212120 its reverse (212121111), we get a palindrome (1323333231).

It can be divided in two parts, 11112 and 12120, that added together give a palindrome (23232).

The spelling of 1111212120 in words is "one billion, one hundred eleven million, two hundred twelve thousand, one hundred twenty".