121329613056 has 144 divisors (see below), whose sum is σ = 324827737920. Its totient is φ = 40204369920.

The previous prime is 121329613051. The next prime is 121329613057. The reversal of 121329613056 is 650316923121.

It is not an unprimeable number, because it can be changed into a prime (121329613051) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 141244755 + ... + 141245613.

It is an arithmetic number, because the mean of its divisors is an integer number (2255748180).

Almost surely, 2^121329613056 is an apocalyptic number.

121329613056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121329613056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (162413868960).

121329613056 is an abundant number, since it is smaller than the sum of its proper divisors (203498124864).

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

121329613056 is an equidigital number, since it uses as much as digits as its factorization.

121329613056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1752 (or 1738 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 39.

The spelling of 121329613056 in words is "one hundred twenty-one billion, three hundred twenty-nine million, six hundred thirteen thousand, fifty-six".