11875784280021 has 24 divisors (see below), whose sum is σ = 17869013111040. Its totient is φ = 7881686392032.

The previous prime is 11875784280013. The next prime is 11875784280071. The reversal of 11875784280021 is 12008248757811.

11875784280021 is a `hidden beast` number, since 1 + 1 + 8 + 7 + 578 + 42 + 8 + 0 + 0 + 21 = 666.

It is not a de Polignac number, because 11875784280021 - 2³ = 11875784280013 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11875784280021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11875784280071) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 109523256 + ... + 109631633.

It is an arithmetic number, because the mean of its divisors is an integer number (744542212960).

Almost surely, 2^{11875784280021} is an apocalyptic number.

It is an amenable number.

11875784280021 is a deficient number, since it is larger than the sum of its proper divisors (5993228831019).

11875784280021 is an equidigital number, since it uses as much as digits as its factorization.

11875784280021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219155127 (or 219155115 counting only the distinct ones).

The product of its (nonzero) digits is 2007040, while the sum is 54.

The spelling of 11875784280021 in words is "eleven trillion, eight hundred seventy-five billion, seven hundred eighty-four million, two hundred eighty thousand, twenty-one".