16421089 has 2 divisors, whose sum is σ = 16421090. Its totient is φ = 16421088.

The previous prime is 16421087. The next prime is 16421107. The reversal of 16421089 is 98012461.

It is a happy number.

16421089 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12780625 + 3640464 = 3575^2 + 1908^2 .

It is a cyclic number.

It is not a de Polignac number, because 16421089 - 2¹ = 16421087 is a prime.

Together with 16421087, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16421089.

It is not a weakly prime, because it can be changed into another prime (16421087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8210544 + 8210545.

It is an arithmetic number, because the mean of its divisors is an integer number (8210545).

Almost surely, 2^16421089 is an apocalyptic number.

It is an amenable number.

16421089 is a deficient number, since it is larger than the sum of its proper divisors (1).

16421089 is an equidigital number, since it uses as much as digits as its factorization.

16421089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 16421089 is about 4052.2942884248. The cubic root of 16421089 is about 254.1756746546.

The spelling of 16421089 in words is "sixteen million, four hundred twenty-one thousand, eighty-nine".