121770828688 has 80 divisors (see below), whose sum is σ = 255412224000. Its totient is φ = 56075310720.

The previous prime is 121770828643. The next prime is 121770828701. The reversal of 121770828688 is 886828077121.

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, 2243373 + ... + 2297011.

It is an arithmetic number, because the mean of its divisors is an integer number (3192652800).

Almost surely, 2^121770828688 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121770828688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (127706112000).

121770828688 is an abundant number, since it is smaller than the sum of its proper divisors (133641395312).

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

121770828688 is a wasteful number, since it uses less digits than its factorization.

121770828688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53900 (or 53894 counting only the distinct ones).

The product of its (nonzero) digits is 4816896, while the sum is 58.

The spelling of 121770828688 in words is "one hundred twenty-one billion, seven hundred seventy million, eight hundred twenty-eight thousand, six hundred eighty-eight".