100121212220100 has 36 divisors (see below), whose sum is σ = 289684040691024. Its totient is φ = 26698989925280.

The previous prime is 100121212220077. The next prime is 100121212220101. The reversal of 100121212220100 is 1022212121001.

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 100121212220100.

It is not an unprimeable number, because it can be changed into a prime (100121212220101) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 166868686734 + ... + 166868687333.

It is an arithmetic number, because the mean of its divisors is an integer number (8046778908084).

Almost surely, 2^{100121212220100} is an apocalyptic number.

100121212220100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

100121212220100 is an abundant number, since it is smaller than the sum of its proper divisors (189562828470924).

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

100121212220100 is a wasteful number, since it uses less digits than its factorization.

100121212220100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333737374084 (or 333737374077 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 100121212220100 its reverse (1022212121001), we get a palindrome (101143424341101).

Subtracting from 100121212220100 its reverse (1022212121001), we obtain a palindrome (99099000099099).

The spelling of 100121212220100 in words is "one hundred trillion, one hundred twenty-one billion, two hundred twelve million, two hundred twenty thousand, one hundred".