121200111210120 has 64 divisors (see below), whose sum is σ = 363912974061120. Its totient is φ = 32292239395584.

The previous prime is 121200111210103. The next prime is 121200111210161. The reversal of 121200111210120 is 21012111002121.

It is a happy number.

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 121200111210120.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 434082679 + ... + 434361798.

It is an arithmetic number, because the mean of its divisors is an integer number (5686140219705).

Almost surely, 2^{121200111210120} is an apocalyptic number.

121200111210120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121200111210120 is an abundant number, since it is smaller than the sum of its proper divisors (242712862851000).

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

121200111210120 is a wasteful number, since it uses less digits than its factorization.

121200111210120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 868445654 (or 868445650 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 121200111210120 its reverse (21012111002121), we get a palindrome (142212222212241).

The spelling of 121200111210120 in words is "one hundred twenty-one trillion, two hundred billion, one hundred eleven million, two hundred ten thousand, one hundred twenty".