16851421242 has 24 divisors (see below), whose sum is σ = 36527778144. Its totient is φ = 5614622664.

The previous prime is 16851421211. The next prime is 16851421243. The reversal of 16851421242 is 24212415861.

16851421242 is a `hidden beast` number, since 16 + 8 + 514 + 2 + 124 + 2 = 666.

16851421242 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 16851421197 and 16851421206.

It is not an unprimeable number, because it can be changed into a prime (16851421243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 168318 + ... + 249065.

It is an arithmetic number, because the mean of its divisors is an integer number (1521990756).

Almost surely, 2^16851421242 is an apocalyptic number.

16851421242 is an abundant number, since it is smaller than the sum of its proper divisors (19676356902).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16851421242 is a wasteful number, since it uses less digits than its factorization.

16851421242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 419634 (or 419631 counting only the distinct ones).

The product of its digits is 30720, while the sum is 36.

The spelling of 16851421242 in words is "sixteen billion, eight hundred fifty-one million, four hundred twenty-one thousand, two hundred forty-two".