100221121100 has 18 divisors (see below), whose sum is σ = 217479833004. Its totient is φ = 40088448400.

The previous prime is 100221121057. The next prime is 100221121103. The reversal of 100221121100 is 1121122001.

It is a super-2 number, since 2×100221121100² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (100221121103) 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 5 ways as a sum of consecutive naturals, for example, 501105506 + ... + 501105705.

Almost surely, 2^100221121100 is an apocalyptic number.

100221121100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

100221121100 is an abundant number, since it is smaller than the sum of its proper divisors (117258711904).

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

100221121100 is a wasteful number, since it uses less digits than its factorization.

100221121100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1002211225 (or 1002211218 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 100221121100 its reverse (1121122001), we get a palindrome (101342243101).

Subtracting from 100221121100 its reverse (1121122001), we obtain a palindrome (99099999099).

The spelling of 100221121100 in words is "one hundred billion, two hundred twenty-one million, one hundred twenty-one thousand, one hundred".