121200312000000 has 280 divisors, whose sum is σ = 403601421491928. Its totient is φ = 32320076800000.

The previous prime is 121200311999981. The next prime is 121200312000013. The reversal of 121200312000000 is 213002121.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a self number, because there is not a number n which added to its sum of digits gives 121200312000000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 21474994 + ... + 26525006.

Almost surely, 2^{121200312000000} is an apocalyptic number.

121200312000000 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 121200312000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (201800710745964).

121200312000000 is an abundant number, since it is smaller than the sum of its proper divisors (282401109491928).

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

121200312000000 is an frugal number, since it uses more digits than its factorization.

121200312000000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5050064 (or 5050023 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 121200312000000 its reverse (213002121), we get a palindrome (121200525002121).

The spelling of 121200312000000 in words is "one hundred twenty-one trillion, two hundred billion, three hundred twelve million", and thus it is an aban number.