16384421 has 2 divisors, whose sum is σ = 16384422. Its totient is φ = 16384420.

The previous prime is 16384409. The next prime is 16384427. The reversal of 16384421 is 12448361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16120225 + 264196 = 4015^2 + 514^2 .

It is a cyclic number.

It is not a de Polignac number, because 16384421 - 2²² = 12190117 is a prime.

It is a plaindrome in base 15.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16384427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8192210 + 8192211.

It is an arithmetic number, because the mean of its divisors is an integer number (8192211).

Almost surely, 2^16384421 is an apocalyptic number.

It is an amenable number.

16384421 is a deficient number, since it is larger than the sum of its proper divisors (1).

16384421 is an equidigital number, since it uses as much as digits as its factorization.

16384421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4608, while the sum is 29.

The square root of 16384421 is about 4047.7674093258. The cubic root of 16384421 is about 253.9863437385.

The spelling of 16384421 in words is "sixteen million, three hundred eighty-four thousand, four hundred twenty-one".