121312200120 has 128 divisors (see below), whose sum is σ = 366518476800. Its totient is φ = 32120856576.

The previous prime is 121312200101. The next prime is 121312200143. The reversal of 121312200120 is 21002213121.

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 121312200120.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21780696 + ... + 21786264.

It is an arithmetic number, because the mean of its divisors is an integer number (2863425600).

Almost surely, 2^121312200120 is an apocalyptic number.

121312200120 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 121312200120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (183259238400).

121312200120 is an abundant number, since it is smaller than the sum of its proper divisors (245206276680).

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

121312200120 is a wasteful number, since it uses less digits than its factorization.

121312200120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6837 (or 6833 counting only the distinct ones).

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

Adding to 121312200120 its reverse (21002213121), we get a palindrome (142314413241).

The spelling of 121312200120 in words is "one hundred twenty-one billion, three hundred twelve million, two hundred thousand, one hundred twenty".