121861830784 has 64 divisors (see below), whose sum is σ = 251662478400. Its totient is φ = 58708177920.

The previous prime is 121861830763. The next prime is 121861830809. The reversal of 121861830784 is 487038168121.

It is a tau number, because it is divible by the number of its divisors (64).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1774039 + ... + 1841449.

It is an arithmetic number, because the mean of its divisors is an integer number (3932226225).

Almost surely, 2^121861830784 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 121861830784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (125831239200).

121861830784 is an abundant number, since it is smaller than the sum of its proper divisors (129800647616).

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

121861830784 is an equidigital number, since it uses as much as digits as its factorization.

121861830784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67941 (or 67929 counting only the distinct ones).

The product of its (nonzero) digits is 516096, while the sum is 49.

The spelling of 121861830784 in words is "one hundred twenty-one billion, eight hundred sixty-one million, eight hundred thirty thousand, seven hundred eighty-four".