21127417 has 2 divisors, whose sum is σ = 21127418. Its totient is φ = 21127416.

The previous prime is 21127397. The next prime is 21127459. The reversal of 21127417 is 71472112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18627856 + 2499561 = 4316^2 + 1581^2 .

It is a cyclic number.

It is not a de Polignac number, because 21127417 - 2¹⁵ = 21094649 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21127391 and 21127400.

It is not a weakly prime, because it can be changed into another prime (21127217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10563708 + 10563709.

It is an arithmetic number, because the mean of its divisors is an integer number (10563709).

Almost surely, 2^21127417 is an apocalyptic number.

It is an amenable number.

21127417 is a deficient number, since it is larger than the sum of its proper divisors (1).

21127417 is an equidigital number, since it uses as much as digits as its factorization.

21127417 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 784, while the sum is 25.

The square root of 21127417 is about 4596.4570051291. The cubic root of 21127417 is about 276.4492831211.

Adding to 21127417 its reverse (71472112), we get a palindrome (92599529).

The spelling of 21127417 in words is "twenty-one million, one hundred twenty-seven thousand, four hundred seventeen".