121110020100 has 144 divisors (see below), whose sum is σ = 389626867840. Its totient is φ = 32272732800.

The previous prime is 121110020051. The next prime is 121110020159. The reversal of 121110020100 is 1020011121.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3907665 + ... + 3938535.

Almost surely, 2^121110020100 is an apocalyptic number.

121110020100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121110020100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (194813433920).

121110020100 is an abundant number, since it is smaller than the sum of its proper divisors (268516847740).

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

121110020100 is a wasteful number, since it uses less digits than its factorization.

121110020100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32347 (or 32334 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 121110020100 its reverse (1020011121), we get a palindrome (122130031221).

The spelling of 121110020100 in words is "one hundred twenty-one billion, one hundred ten million, twenty thousand, one hundred".