121312120200 has 384 divisors, whose sum is σ = 399814410240. Its totient is φ = 30378240000.

The previous prime is 121312120199. The next prime is 121312120213. The reversal of 121312120200 is 2021213121.

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 121312120200.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 206664307 + ... + 206664893.

It is an arithmetic number, because the mean of its divisors is an integer number (1041183360).

Almost surely, 2^121312120200 is an apocalyptic number.

121312120200 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 121312120200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (199907205120).

121312120200 is an abundant number, since it is smaller than the sum of its proper divisors (278502290040).

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

121312120200 is a wasteful number, since it uses less digits than its factorization.

121312120200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 949 (or 940 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 121312120200 its reverse (2021213121), we get a palindrome (123333333321).

It can be divided in two parts, 1213121 and 20200, that added together give a palindrome (1233321).

The spelling of 121312120200 in words is "one hundred twenty-one billion, three hundred twelve million, one hundred twenty thousand, two hundred".