111211111121100 has 36 divisors (see below), whose sum is σ = 321770814844584. Its totient is φ = 29656296298880.

The previous prime is 111211111121087. The next prime is 111211111121107. The reversal of 111211111121100 is 1121111112111.

It is a happy number.

It is a super-4 number, since 4×111211111121100⁴ (a number of 57 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

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 111211111121100.

It is not an unprimeable number, because it can be changed into a prime (111211111121107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 185351851569 + ... + 185351852168.

Almost surely, 2^{111211111121100} is an apocalyptic number.

111211111121100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111211111121100 is an abundant number, since it is smaller than the sum of its proper divisors (210559703723484).

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

111211111121100 is a wasteful number, since it uses less digits than its factorization.

111211111121100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 370703703754 (or 370703703747 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 15.

Adding to 111211111121100 its reverse (1121111112111), we get a palindrome (112332222233211).

The spelling of 111211111121100 in words is "one hundred eleven trillion, two hundred eleven billion, one hundred eleven million, one hundred twenty-one thousand, one hundred".