1111212111100 has 288 divisors, whose sum is σ = 3144884714496. Its totient is φ = 330728140800.

The previous prime is 1111212111077. The next prime is 1111212111133. The reversal of 1111212111100 is 11112121111.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 283253739 + ... + 283257661.

It is an arithmetic number, because the mean of its divisors is an integer number (10919738592).

Almost surely, 2^{1111212111100} is an apocalyptic number.

1111212111100 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 1111212111100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1572442357248).

1111212111100 is an abundant number, since it is smaller than the sum of its proper divisors (2033672603396).

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

1111212111100 is a wasteful number, since it uses less digits than its factorization.

1111212111100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5805 (or 5798 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 13.

Adding to 1111212111100 its reverse (11112121111), we get a palindrome (1122324232211).

1111212111100 divided by its reverse (11112121111) gives a square (100 = 10²).

The spelling of 1111212111100 in words is "one trillion, one hundred eleven billion, two hundred twelve million, one hundred eleven thousand, one hundred".