121840872055 has 16 divisors (see below), whose sum is σ = 167178585600. Its totient is φ = 83506760352.

The previous prime is 121840872007. The next prime is 121840872061. The reversal of 121840872055 is 550278048121.

It is a cyclic number.

It is not a de Polignac number, because 121840872055 - 2¹¹ = 121840870007 is a prime.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 787755 + ... + 929644.

It is an arithmetic number, because the mean of its divisors is an integer number (10448661600).

Almost surely, 2^121840872055 is an apocalyptic number.

121840872055 is a deficient number, since it is larger than the sum of its proper divisors (45337713545).

121840872055 is a wasteful number, since it uses less digits than its factorization.

121840872055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1719438.

The product of its (nonzero) digits is 179200, while the sum is 43.

The spelling of 121840872055 in words is "one hundred twenty-one billion, eight hundred forty million, eight hundred seventy-two thousand, fifty-five".