16421963 has 2 divisors, whose sum is σ = 16421964. Its totient is φ = 16421962.

The previous prime is 16421897. The next prime is 16422019. The reversal of 16421963 is 36912461.

It is a strong prime.

It is an emirp because it is prime and its reverse (36912461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16421963 - 2⁸ = 16421707 is a prime.

It is not a weakly prime, because it can be changed into another prime (16421063) 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, 8210981 + 8210982.

It is an arithmetic number, because the mean of its divisors is an integer number (8210982).

Almost surely, 2^16421963 is an apocalyptic number.

16421963 is a deficient number, since it is larger than the sum of its proper divisors (1).

16421963 is an equidigital number, since it uses as much as digits as its factorization.

16421963 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7776, while the sum is 32.

The square root of 16421963 is about 4052.4021271340. The cubic root of 16421963 is about 254.1801840104.

The spelling of 16421963 in words is "sixteen million, four hundred twenty-one thousand, nine hundred sixty-three".