16472021 has 2 divisors, whose sum is σ = 16472022. Its totient is φ = 16472020.

The previous prime is 16472009. The next prime is 16472041. The reversal of 16472021 is 12027461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8491396 + 7980625 = 2914^2 + 2825^2 .

It is a cyclic number.

It is not a de Polignac number, because 16472021 - 2⁶ = 16471957 is a prime.

It is a Chen prime.

It is a plaindrome in base 14.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16472041) 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, 8236010 + 8236011.

It is an arithmetic number, because the mean of its divisors is an integer number (8236011).

Almost surely, 2^16472021 is an apocalyptic number.

It is an amenable number.

16472021 is a deficient number, since it is larger than the sum of its proper divisors (1).

16472021 is an equidigital number, since it uses as much as digits as its factorization.

16472021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 16472021 is about 4058.5737642674. The cubic root of 16472021 is about 254.4381889999.

Adding to 16472021 its reverse (12027461), we get a palindrome (28499482).

The spelling of 16472021 in words is "sixteen million, four hundred seventy-two thousand, twenty-one".