16221823 has 2 divisors, whose sum is σ = 16221824. Its totient is φ = 16221822.

The previous prime is 16221761. The next prime is 16221827. The reversal of 16221823 is 32812261.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16221823 - 2⁹ = 16221311 is a prime.

It is equal to p_1044457 and since 16221823 and 1044457 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16221827) 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, 8110911 + 8110912.

It is an arithmetic number, because the mean of its divisors is an integer number (8110912).

Almost surely, 2^16221823 is an apocalyptic number.

16221823 is a deficient number, since it is larger than the sum of its proper divisors (1).

16221823 is an equidigital number, since it uses as much as digits as its factorization.

16221823 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1152, while the sum is 25.

The square root of 16221823 is about 4027.6324310940. The cubic root of 16221823 is about 253.1433673203.

The spelling of 16221823 in words is "sixteen million, two hundred twenty-one thousand, eight hundred twenty-three".