16846845221 has 2 divisors, whose sum is σ = 16846845222. Its totient is φ = 16846845220.

The previous prime is 16846845209. The next prime is 16846845229. The reversal of 16846845221 is 12254864861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13267814596 + 3579030625 = 115186^2 + 59825^2 .

It is a cyclic number.

It is not a de Polignac number, because 16846845221 - 2²² = 16842650917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16846845229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8423422610 + 8423422611.

It is an arithmetic number, because the mean of its divisors is an integer number (8423422611).

Almost surely, 2^16846845221 is an apocalyptic number.

It is an amenable number.

16846845221 is a deficient number, since it is larger than the sum of its proper divisors (1).

16846845221 is an equidigital number, since it uses as much as digits as its factorization.

16846845221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 737280, while the sum is 47.

The spelling of 16846845221 in words is "sixteen billion, eight hundred forty-six million, eight hundred forty-five thousand, two hundred twenty-one".