16621207 has 2 divisors, whose sum is σ = 16621208. Its totient is φ = 16621206.

The previous prime is 16621193. The next prime is 16621217. The reversal of 16621207 is 70212661.

It is a strong prime.

It is an emirp because it is prime and its reverse (70212661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16621207 - 2⁷ = 16621079 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16621217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8310603 + 8310604.

It is an arithmetic number, because the mean of its divisors is an integer number (8310604).

Almost surely, 2^16621207 is an apocalyptic number.

16621207 is a deficient number, since it is larger than the sum of its proper divisors (1).

16621207 is an equidigital number, since it uses as much as digits as its factorization.

16621207 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 16621207 is about 4076.9114535393. The cubic root of 16621207 is about 255.2040248495.

Adding to 16621207 its reverse (70212661), we get a palindrome (86833868).

The spelling of 16621207 in words is "sixteen million, six hundred twenty-one thousand, two hundred seven".