16711021 has 2 divisors, whose sum is σ = 16711022. Its totient is φ = 16711020.

The previous prime is 16711003. The next prime is 16711031. The reversal of 16711021 is 12011761.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16695396 + 15625 = 4086^2 + 125^2 .

It is a cyclic number.

It is not a de Polignac number, because 16711021 - 2⁷ = 16710893 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16711021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16711001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8355510 + 8355511.

It is an arithmetic number, because the mean of its divisors is an integer number (8355511).

Almost surely, 2^16711021 is an apocalyptic number.

It is an amenable number.

16711021 is a deficient number, since it is larger than the sum of its proper divisors (1).

16711021 is an equidigital number, since it uses as much as digits as its factorization.

16711021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 84, while the sum is 19.

The square root of 16711021 is about 4087.9115694936. The cubic root of 16711021 is about 255.6628710457.

Adding to 16711021 its reverse (12011761), we get a palindrome (28722782).

The spelling of 16711021 in words is "sixteen million, seven hundred eleven thousand, twenty-one".