121204120200 has 48 divisors (see below), whose sum is σ = 375732774480. Its totient is φ = 32321098560.

The previous prime is 121204120187. The next prime is 121204120249. The reversal of 121204120200 is 2021402121.

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 121204120200.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 101002834 + ... + 101004033.

It is an arithmetic number, because the mean of its divisors is an integer number (7827766135).

Almost surely, 2^121204120200 is an apocalyptic number.

121204120200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121204120200 is an abundant number, since it is smaller than the sum of its proper divisors (254528654280).

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

121204120200 is a wasteful number, since it uses less digits than its factorization.

121204120200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202006886 (or 202006877 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 121204120200 its reverse (2021402121), we get a palindrome (123225522321).

The spelling of 121204120200 in words is "one hundred twenty-one billion, two hundred four million, one hundred twenty thousand, two hundred".