121720550124 has 36 divisors (see below), whose sum is σ = 290773265496. Its totient is φ = 39629939328.

The previous prime is 121720550123. The next prime is 121720550173. The reversal of 121720550124 is 421055027121.

It is a happy number.

121720550124 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 121720550091 and 121720550100.

It is not an unprimeable number, because it can be changed into a prime (121720550123) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 2720749 + ... + 2765124.

Almost surely, 2^121720550124 is an apocalyptic number.

It is an amenable number.

121720550124 is an abundant number, since it is smaller than the sum of its proper divisors (169052715372).

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

121720550124 is a wasteful number, since it uses less digits than its factorization.

121720550124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5485966 (or 5485921 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 30.

Adding to 121720550124 its reverse (421055027121), we get a palindrome (542775577245).

The spelling of 121720550124 in words is "one hundred twenty-one billion, seven hundred twenty million, five hundred fifty thousand, one hundred twenty-four".