840221900057871 has 16 divisors (see below), whose sum is σ = 1317995137346400. Its totient is φ = 527198054937984.

The previous prime is 840221900057867. The next prime is 840221900057893. The reversal of 840221900057871 is 178750009122048.

840221900057871 is a `hidden beast` number, since 8 + 40 + 2 + 21 + 9 + 0 + 0 + 0 + 578 + 7 + 1 = 666.

It is not a de Polignac number, because 840221900057871 - 2² = 840221900057867 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840221900257871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 915274400476 + ... + 915274401393.

It is an arithmetic number, because the mean of its divisors is an integer number (82374696084150).

Almost surely, 2^{840221900057871} is an apocalyptic number.

840221900057871 is a deficient number, since it is larger than the sum of its proper divisors (477773237288529).

840221900057871 is a wasteful number, since it uses less digits than its factorization.

840221900057871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1830548801895 (or 1830548801889 counting only the distinct ones).

The product of its (nonzero) digits is 2257920, while the sum is 54.

The spelling of 840221900057871 in words is "eight hundred forty trillion, two hundred twenty-one billion, nine hundred million, fifty-seven thousand, eight hundred seventy-one".