121200202100 has 144 divisors (see below), whose sum is σ = 271022653440. Its totient is φ = 47031062400.

The previous prime is 121200202091. The next prime is 121200202111. The reversal of 121200202100 is 1202002121.

It is a happy number.

It is a congruent number.

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, 125335817 + ... + 125336783.

It is an arithmetic number, because the mean of its divisors is an integer number (1882101760).

Almost surely, 2^121200202100 is an apocalyptic number.

121200202100 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 121200202100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (135511326720).

121200202100 is an abundant number, since it is smaller than the sum of its proper divisors (149822451340).

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

121200202100 is a wasteful number, since it uses less digits than its factorization.

121200202100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1318 (or 1311 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 121200202100 its reverse (1202002121), we get a palindrome (122402204221).

The spelling of 121200202100 in words is "one hundred twenty-one billion, two hundred million, two hundred two thousand, one hundred".