121687488788 has 12 divisors (see below), whose sum is σ = 213489513972. Its totient is φ = 60690484800.

The previous prime is 121687488743. The next prime is 121687488821. The reversal of 121687488788 is 887884786121.

It can be written as a sum of positive squares in 2 ways, for example, as 97342752004 + 24344736784 = 311998^2 + 156028^2 .

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 3 ways as a sum of consecutive naturals, for example, 38313113 + ... + 38316288.

It is an arithmetic number, because the mean of its divisors is an integer number (17790792831).

Almost surely, 2^121687488788 is an apocalyptic number.

It is an amenable number.

121687488788 is a deficient number, since it is larger than the sum of its proper divisors (91802025184).

121687488788 is a wasteful number, since it uses less digits than its factorization.

121687488788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76629802 (or 76629800 counting only the distinct ones).

The product of its digits is 77070336, while the sum is 68.

The spelling of 121687488788 in words is "one hundred twenty-one billion, six hundred eighty-seven million, four hundred eighty-eight thousand, seven hundred eighty-eight".