16712021 has 2 divisors, whose sum is σ = 16712022. Its totient is φ = 16712020.

The previous prime is 16711991. The next prime is 16712023. The reversal of 16712021 is 12021761.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15295921 + 1416100 = 3911^2 + 1190^2 .

It is an emirp because it is prime and its reverse (12021761) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16712021 - 2⁶ = 16711957 is a prime.

Together with 16712023, it forms a pair of twin primes.

It is a Chen prime.

It is a zygodrome in base 4.

It is a junction number, because it is equal to n+sod(n) for n = 16711984 and 16712002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16712023) 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, 8356010 + 8356011.

It is an arithmetic number, because the mean of its divisors is an integer number (8356011).

Almost surely, 2^16712021 is an apocalyptic number.

It is an amenable number.

16712021 is a deficient number, since it is larger than the sum of its proper divisors (1).

16712021 is an equidigital number, since it uses as much as digits as its factorization.

16712021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 168, while the sum is 20.

The square root of 16712021 is about 4088.0338795074. The cubic root of 16712021 is about 255.6679706299.

Adding to 16712021 its reverse (12021761), we get a palindrome (28733782).

The spelling of 16712021 in words is "sixteen million, seven hundred twelve thousand, twenty-one".