121317720528 has 20 divisors (see below), whose sum is σ = 313404111488. Its totient is φ = 40439240160.

The previous prime is 121317720521. The next prime is 121317720529. The reversal of 121317720528 is 825027713121.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121317720521) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1263726208 + ... + 1263726303.

Almost surely, 2^121317720528 is an apocalyptic number.

It is an amenable number.

121317720528 is an abundant number, since it is smaller than the sum of its proper divisors (192086390960).

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

121317720528 is a wasteful number, since it uses less digits than its factorization.

121317720528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2527452522 (or 2527452516 counting only the distinct ones).

The product of its (nonzero) digits is 47040, while the sum is 39.

The spelling of 121317720528 in words is "one hundred twenty-one billion, three hundred seventeen million, seven hundred twenty thousand, five hundred twenty-eight".