121371177728 has 72 divisors (see below), whose sum is σ = 243331618320. Its totient is φ = 60419932160.

The previous prime is 121371177691. The next prime is 121371177743. The reversal of 121371177728 is 827771173121.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71520176 + ... + 71521872.

It is an arithmetic number, because the mean of its divisors is an integer number (3379605810).

Almost surely, 2^121371177728 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 121371177728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (121665809160).

121371177728 is an abundant number, since it is smaller than the sum of its proper divisors (121960440592).

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

121371177728 is an equidigital number, since it uses as much as digits as its factorization.

121371177728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2773 (or 2759 counting only the distinct ones).

The product of its digits is 230496, while the sum is 47.

The spelling of 121371177728 in words is "one hundred twenty-one billion, three hundred seventy-one million, one hundred seventy-seven thousand, seven hundred twenty-eight".