121212121200120 has 192 divisors, whose sum is σ = 402250695930720. Its totient is φ = 31647743373312.

The previous prime is 121212121200089. The next prime is 121212121200127. The reversal of 121212121200120 is 21002121212121.

121212121200120 is a `hidden beast` number, since 1 + 212 + 1 + 212 + 120 + 0 + 120 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 121212121200093 and 121212121200102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121212121200127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 13232974 + ... + 20433693.

Almost surely, 2^{121212121200120} is an apocalyptic number.

121212121200120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121212121200120 is an abundant number, since it is smaller than the sum of its proper divisors (281038574730600).

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

121212121200120 is a wasteful number, since it uses less digits than its factorization.

121212121200120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33666894 (or 33666887 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 121212121200120 its reverse (21002121212121), we get a palindrome (142214242412241).

The spelling of 121212121200120 in words is "one hundred twenty-one trillion, two hundred twelve billion, one hundred twenty-one million, two hundred thousand, one hundred twenty".