121555265056 has 48 divisors (see below), whose sum is σ = 247608748800. Its totient is φ = 58671260928.

The previous prime is 121555264997. The next prime is 121555265059. The reversal of 121555265056 is 650562555121.

121555265056 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (121555265059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8217475 + ... + 8232253.

It is an arithmetic number, because the mean of its divisors is an integer number (5158515600).

Almost surely, 2^121555265056 is an apocalyptic number.

121555265056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

121555265056 is an abundant number, since it is smaller than the sum of its proper divisors (126053483744).

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

121555265056 is a wasteful number, since it uses less digits than its factorization.

121555265056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23681 (or 23673 counting only the distinct ones).

The product of its (nonzero) digits is 450000, while the sum is 43.

The spelling of 121555265056 in words is "one hundred twenty-one billion, five hundred fifty-five million, two hundred sixty-five thousand, fifty-six".