16821415189 has 2 divisors, whose sum is σ = 16821415190. Its totient is φ = 16821415188.

The previous prime is 16821415181. The next prime is 16821415213. The reversal of 16821415189 is 98151412861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14482919025 + 2338496164 = 120345^2 + 48358^2 .

It is a cyclic number.

It is not a de Polignac number, because 16821415189 - 2³ = 16821415181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16821415181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8410707594 + 8410707595.

It is an arithmetic number, because the mean of its divisors is an integer number (8410707595).

Almost surely, 2^16821415189 is an apocalyptic number.

It is an amenable number.

16821415189 is a deficient number, since it is larger than the sum of its proper divisors (1).

16821415189 is an equidigital number, since it uses as much as digits as its factorization.

16821415189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 138240, while the sum is 46.

The spelling of 16821415189 in words is "sixteen billion, eight hundred twenty-one million, four hundred fifteen thousand, one hundred eighty-nine".