121730710640 has 160 divisors (see below), whose sum is σ = 360369506304. Its totient is φ = 37134673920.

The previous prime is 121730710631. The next prime is 121730710669. The reversal of 121730710640 is 46017037121.

It is a junction number, because it is equal to n+sod(n) for n = 121730710597 and 121730710606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 79292 + ... + 499748.

Almost surely, 2^121730710640 is an apocalyptic number.

121730710640 is a gapful number since it is divisible by the number (10) 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 121730710640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (180184753152).

121730710640 is an abundant number, since it is smaller than the sum of its proper divisors (238638795664).

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

121730710640 is a wasteful number, since it uses less digits than its factorization.

121730710640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420535 (or 420529 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 32.

Adding to 121730710640 its reverse (46017037121), we get a palindrome (167747747761).

The spelling of 121730710640 in words is "one hundred twenty-one billion, seven hundred thirty million, seven hundred ten thousand, six hundred forty".