121720550122 has 4 divisors (see below), whose sum is σ = 182580825186. Its totient is φ = 60860275060.

The previous prime is 121720550111. The next prime is 121720550123. The reversal of 121720550122 is 221055027121.

121720550122 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 221055027121 = 67 ⋅3299328763.

It can be written as a sum of positive squares in only one way, i.e., 118948422321 + 2772127801 = 344889^2 + 52651^2 .

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 as a sum of consecutive naturals, namely, 30430137529 + ... + 30430137532.

Almost surely, 2^121720550122 is an apocalyptic number.

121720550122 is a deficient number, since it is larger than the sum of its proper divisors (60860275064).

121720550122 is an equidigital number, since it uses as much as digits as its factorization.

121720550122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60860275063.

The product of its (nonzero) digits is 2800, while the sum is 28.

Adding to 121720550122 its reverse (221055027121), we get a palindrome (342775577243).

The spelling of 121720550122 in words is "one hundred twenty-one billion, seven hundred twenty million, five hundred fifty thousand, one hundred twenty-two".