111221212212100 has 72 divisors (see below), whose sum is σ = 249143789776896. Its totient is φ = 43051942560000.

The previous prime is 111221212212031. The next prime is 111221212212127. The reversal of 111221212212100 is 1212212122111.

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 23 ways as a sum of consecutive naturals, for example, 95243760 + ... + 96404440.

It is an arithmetic number, because the mean of its divisors is an integer number (3460330413568).

Almost surely, 2^{111221212212100} is an apocalyptic number.

111221212212100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111221212212100 is an abundant number, since it is smaller than the sum of its proper divisors (137922577564796).

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

111221212212100 is a wasteful number, since it uses less digits than its factorization.

111221212212100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1191637 (or 1191630 counting only the distinct ones).

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

Adding to 111221212212100 its reverse (1212212122111), we get a palindrome (112433424334211).

The spelling of 111221212212100 in words is "one hundred eleven trillion, two hundred twenty-one billion, two hundred twelve million, two hundred twelve thousand, one hundred".