111222122121100 has 18 divisors (see below), whose sum is σ = 241352005003004. Its totient is φ = 44488848848400.

The previous prime is 111222122121029. The next prime is 111222122121133. The reversal of 111222122121100 is 1121221222111.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 556110610506 + ... + 556110610705.

Almost surely, 2^{111222122121100} is an apocalyptic number.

111222122121100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111222122121100 is an abundant number, since it is smaller than the sum of its proper divisors (130129882881904).

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

111222122121100 is a wasteful number, since it uses less digits than its factorization.

111222122121100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1112221221225 (or 1112221221218 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 111222122121100 its reverse (1121221222111), we get a palindrome (112343343343211).

The spelling of 111222122121100 in words is "one hundred eleven trillion, two hundred twenty-two billion, one hundred twenty-two million, one hundred twenty-one thousand, one hundred".