121200123120 has 80 divisors (see below), whose sum is σ = 375890004000. Its totient is φ = 32305441792.

The previous prime is 121200123013. The next prime is 121200123211. The reversal of 121200123120 is 21321002121.

It is a tau number, because it is divible by the number of its divisors (80).

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 121200123120.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 424006 + ... + 649754.

It is an arithmetic number, because the mean of its divisors is an integer number (4698625050).

Almost surely, 2^121200123120 is an apocalyptic number.

121200123120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121200123120 is an abundant number, since it is smaller than the sum of its proper divisors (254689880880).

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

121200123120 is a wasteful number, since it uses less digits than its factorization.

121200123120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228002 (or 227996 counting only the distinct ones).

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

Adding to 121200123120 its reverse (21321002121), we get a palindrome (142521125241).

The spelling of 121200123120 in words is "one hundred twenty-one billion, two hundred million, one hundred twenty-three thousand, one hundred twenty".