21114217 has 2 divisors, whose sum is σ = 21114218. Its totient is φ = 21114216.

The previous prime is 21114211. The next prime is 21114229. The reversal of 21114217 is 71241112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19616041 + 1498176 = 4429^2 + 1224^2 .

It is a cyclic number.

It is not a de Polignac number, because 21114217 - 2³ = 21114209 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21114194 and 21114203.

It is not a weakly prime, because it can be changed into another prime (21114211) 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, 10557108 + 10557109.

It is an arithmetic number, because the mean of its divisors is an integer number (10557109).

Almost surely, 2^21114217 is an apocalyptic number.

It is an amenable number.

21114217 is a deficient number, since it is larger than the sum of its proper divisors (1).

21114217 is an equidigital number, since it uses as much as digits as its factorization.

21114217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 112, while the sum is 19.

The square root of 21114217 is about 4595.0208922267. The cubic root of 21114217 is about 276.3916977449.

Adding to 21114217 its reverse (71241112), we get a palindrome (92355329).

It can be divided in two parts, 2111 and 4217, that added together give a triangular number (6328 = T₁₁₂).

The spelling of 21114217 in words is "twenty-one million, one hundred fourteen thousand, two hundred seventeen".