121200200100 has 288 divisors, whose sum is σ = 468736665600. Its totient is φ = 26244777600.

The previous prime is 121200200083. The next prime is 121200200101. The reversal of 121200200100 is 1002002121.

121200200100 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is not an unprimeable number, because it can be changed into a prime (121200200101) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 190345 + ... + 527855.

Almost surely, 2^121200200100 is an apocalyptic number.

121200200100 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 121200200100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (234368332800).

121200200100 is an abundant number, since it is smaller than the sum of its proper divisors (347536465500).

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

121200200100 is a wasteful number, since it uses less digits than its factorization.

121200200100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337560 (or 337547 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 121200200100 its reverse (1002002121), we get a palindrome (122202202221).

The spelling of 121200200100 in words is "one hundred twenty-one billion, two hundred million, two hundred thousand, one hundred".