16851850833421 has 2 divisors, whose sum is σ = 16851850833422. Its totient is φ = 16851850833420.

The previous prime is 16851850833413. The next prime is 16851850833439. The reversal of 16851850833421 is 12433805815861.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8849797969321 + 8002052864100 = 2974861^2 + 2828790^2 .

It is an emirp because it is prime and its reverse (12433805815861) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16851850833421 - 2³ = 16851850833413 is a prime.

It is a super-3 number, since 3×16851850833421³ (a number of 41 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16851850833401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8425925416710 + 8425925416711.

It is an arithmetic number, because the mean of its divisors is an integer number (8425925416711).

Almost surely, 2^{16851850833421} is an apocalyptic number.

It is an amenable number.

16851850833421 is a deficient number, since it is larger than the sum of its proper divisors (1).

16851850833421 is an equidigital number, since it uses as much as digits as its factorization.

16851850833421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5529600, while the sum is 55.

The spelling of 16851850833421 in words is "sixteen trillion, eight hundred fifty-one billion, eight hundred fifty million, eight hundred thirty-three thousand, four hundred twenty-one".