216424421985 has 16 divisors (see below), whose sum is σ = 346330319040. Its totient is φ = 115409277120.

The previous prime is 216424421981. The next prime is 216424422023. The reversal of 216424421985 is 589124424612.

216424421985 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 216424421985 - 2² = 216424421981 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216424421981) 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 15 ways as a sum of consecutive naturals, for example, 962506 + ... + 1165875.

It is an arithmetic number, because the mean of its divisors is an integer number (21645644940).

Almost surely, 2^216424421985 is an apocalyptic number.

It is an amenable number.

216424421985 is a deficient number, since it is larger than the sum of its proper divisors (129905897055).

216424421985 is a wasteful number, since it uses less digits than its factorization.

216424421985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2135168.

The product of its digits is 1105920, while the sum is 48.

The spelling of 216424421985 in words is "two hundred sixteen billion, four hundred twenty-four million, four hundred twenty-one thousand, nine hundred eighty-five".