120821210075871 has 12 divisors (see below), whose sum is σ = 184785380116272. Its totient is φ = 75809386714176.

The previous prime is 120821210075851. The next prime is 120821210075887. The reversal of 120821210075871 is 178570012128021.

120821210075871 is a `hidden beast` number, since 1 + 20 + 8 + 21 + 21 + 0 + 0 + 7 + 587 + 1 = 666.

It is not a de Polignac number, because 120821210075871 - 2⁷ = 120821210075743 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120821210075851) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 394840555651 + ... + 394840555956.

It is an arithmetic number, because the mean of its divisors is an integer number (15398781676356).

Almost surely, 2^{120821210075871} is an apocalyptic number.

120821210075871 is a deficient number, since it is larger than the sum of its proper divisors (63964170040401).

120821210075871 is a wasteful number, since it uses less digits than its factorization.

120821210075871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 789681111630 (or 789681111627 counting only the distinct ones).

The product of its (nonzero) digits is 125440, while the sum is 45.

The spelling of 120821210075871 in words is "one hundred twenty trillion, eight hundred twenty-one billion, two hundred ten million, seventy-five thousand, eight hundred seventy-one".