121597520856 has 64 divisors (see below), whose sum is σ = 349753248000. Its totient is φ = 34508972928.

The previous prime is 121597520827. The next prime is 121597520867. The reversal of 121597520856 is 658025795121.

It is a junction number, because it is equal to n+sod(n) for n = 121597520799 and 121597520808.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2403810 + ... + 2453873.

It is an arithmetic number, because the mean of its divisors is an integer number (5464894500).

Almost surely, 2^121597520856 is an apocalyptic number.

It is an amenable number.

121597520856 is an abundant number, since it is smaller than the sum of its proper divisors (228155727144).

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

121597520856 is a wasteful number, since it uses less digits than its factorization.

121597520856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4857848 (or 4857844 counting only the distinct ones).

The product of its (nonzero) digits is 1512000, while the sum is 51.

The spelling of 121597520856 in words is "one hundred twenty-one billion, five hundred ninety-seven million, five hundred twenty thousand, eight hundred fifty-six".