16421299 has 2 divisors, whose sum is σ = 16421300. Its totient is φ = 16421298.

The previous prime is 16421297. The next prime is 16421323. The reversal of 16421299 is 99212461.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16421299 - 2¹ = 16421297 is a prime.

Together with 16421297, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (16421297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8210649 + 8210650.

It is an arithmetic number, because the mean of its divisors is an integer number (8210650).

Almost surely, 2^16421299 is an apocalyptic number.

16421299 is a deficient number, since it is larger than the sum of its proper divisors (1).

16421299 is an equidigital number, since it uses as much as digits as its factorization.

16421299 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7776, while the sum is 34.

The square root of 16421299 is about 4052.3201995894. The cubic root of 16421299 is about 254.1767581529.

The spelling of 16421299 in words is "sixteen million, four hundred twenty-one thousand, two hundred ninety-nine".