16322021 has 2 divisors, whose sum is σ = 16322022. Its totient is φ = 16322020.

The previous prime is 16322017. The next prime is 16322029. The reversal of 16322021 is 12022361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15100996 + 1221025 = 3886^2 + 1105^2 .

It is a cyclic number.

It is not a de Polignac number, because 16322021 - 2² = 16322017 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16322029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8161010 + 8161011.

It is an arithmetic number, because the mean of its divisors is an integer number (8161011).

Almost surely, 2^16322021 is an apocalyptic number.

It is an amenable number.

16322021 is a deficient number, since it is larger than the sum of its proper divisors (1).

16322021 is an equidigital number, since it uses as much as digits as its factorization.

16322021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 16322021 is about 4040.0521036244. The cubic root of 16322021 is about 253.6634982238.

Adding to 16322021 its reverse (12022361), we get a palindrome (28344382).

The spelling of 16322021 in words is "sixteen million, three hundred twenty-two thousand, twenty-one".