121636513005 has 32 divisors (see below), whose sum is σ = 227153424384. Its totient is φ = 54422170176.

The previous prime is 121636512997. The next prime is 121636513007. The reversal of 121636513005 is 500315636121.

It is not a de Polignac number, because 121636513005 - 2³ = 121636512997 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121636513007) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 12318927 + ... + 12328796.

It is an arithmetic number, because the mean of its divisors is an integer number (7098544512).

Almost surely, 2^121636513005 is an apocalyptic number.

121636513005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121636513005 is a deficient number, since it is larger than the sum of its proper divisors (105516911379).

121636513005 is a wasteful number, since it uses less digits than its factorization.

121636513005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24647785.

The product of its (nonzero) digits is 16200, while the sum is 33.

The spelling of 121636513005 in words is "one hundred twenty-one billion, six hundred thirty-six million, five hundred thirteen thousand, five".