16421297 has 2 divisors, whose sum is σ = 16421298. Its totient is φ = 16421296.

The previous prime is 16421267. The next prime is 16421299. The reversal of 16421297 is 79212461.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16394401 + 26896 = 4049^2 + 164^2 .

It is a cyclic number.

It is not a de Polignac number, because 16421297 - 2⁶ = 16421233 is a prime.

Together with 16421299, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (16421299) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8210648 + 8210649.

It is an arithmetic number, because the mean of its divisors is an integer number (8210649).

Almost surely, 2^16421297 is an apocalyptic number.

It is an amenable number.

16421297 is a deficient number, since it is larger than the sum of its proper divisors (1).

16421297 is an equidigital number, since it uses as much as digits as its factorization.

16421297 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6048, while the sum is 32.

The square root of 16421297 is about 4052.3199528172. The cubic root of 16421297 is about 254.1767478339.

The spelling of 16421297 in words is "sixteen million, four hundred twenty-one thousand, two hundred ninety-seven".