16810121 has 2 divisors, whose sum is σ = 16810122. Its totient is φ = 16810120.

The previous prime is 16810097. The next prime is 16810133. The reversal of 16810121 is 12101861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16810000 + 121 = 4100^2 + 11^2 .

It is a cyclic number.

It is not a de Polignac number, because 16810121 - 2¹⁰ = 16809097 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16810093 and 16810102.

It is not a weakly prime, because it can be changed into another prime (16810151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8405060 + 8405061.

It is an arithmetic number, because the mean of its divisors is an integer number (8405061).

Almost surely, 2^16810121 is an apocalyptic number.

It is an amenable number.

16810121 is a deficient number, since it is larger than the sum of its proper divisors (1).

16810121 is an equidigital number, since it uses as much as digits as its factorization.

16810121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 20.

The square root of 16810121 is about 4100.0147560710. The cubic root of 16810121 is about 256.1672541876.

Adding to 16810121 its reverse (12101861), we get a palindrome (28911982).

The spelling of 16810121 in words is "sixteen million, eight hundred ten thousand, one hundred twenty-one".