16711921 has 2 divisors, whose sum is σ = 16711922. Its totient is φ = 16711920.

The previous prime is 16711889. The next prime is 16711943. The reversal of 16711921 is 12911761.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15124321 + 1587600 = 3889^2 + 1260^2 .

It is a cyclic number.

It is not a de Polignac number, because 16711921 - 2⁵ = 16711889 is a prime.

It is equal to p_1073917 and since 16711921 and 1073917 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16711921.

It is not a weakly prime, because it can be changed into another prime (16711991) 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, 8355960 + 8355961.

It is an arithmetic number, because the mean of its divisors is an integer number (8355961).

Almost surely, 2^16711921 is an apocalyptic number.

It is an amenable number.

16711921 is a deficient number, since it is larger than the sum of its proper divisors (1).

16711921 is an equidigital number, since it uses as much as digits as its factorization.

16711921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 756, while the sum is 28.

The square root of 16711921 is about 4088.0216486707. The cubic root of 16711921 is about 255.6674606806.

The spelling of 16711921 in words is "sixteen million, seven hundred eleven thousand, nine hundred twenty-one".