121781456776 has 32 divisors (see below), whose sum is σ = 260977409280. Its totient is φ = 52188624000.

The previous prime is 121781456773. The next prime is 121781456777. The reversal of 121781456776 is 677654187121.

It is a happy number.

121781456776 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (121781456773) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 907201 + ... + 1032751.

It is an arithmetic number, because the mean of its divisors is an integer number (8155544040).

Almost surely, 2^121781456776 is an apocalyptic number.

It is an amenable number.

121781456776 is an abundant number, since it is smaller than the sum of its proper divisors (139195952504).

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

121781456776 is a wasteful number, since it uses less digits than its factorization.

121781456776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142885 (or 142881 counting only the distinct ones).

The product of its digits is 3951360, while the sum is 55.

The spelling of 121781456776 in words is "one hundred twenty-one billion, seven hundred eighty-one million, four hundred fifty-six thousand, seven hundred seventy-six".