21310417 has 2 divisors, whose sum is σ = 21310418. Its totient is φ = 21310416.

The previous prime is 21310337. The next prime is 21310433. The reversal of 21310417 is 71401312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12453841 + 8856576 = 3529^2 + 2976^2 .

It is a cyclic number.

It is not a de Polignac number, because 21310417 - 2¹¹ = 21308369 is a prime.

It is a super-3 number, since 3×21310417³ (a number of 23 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21310394 and 21310403.

It is not a weakly prime, because it can be changed into another prime (21310477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10655208 + 10655209.

It is an arithmetic number, because the mean of its divisors is an integer number (10655209).

Almost surely, 2^21310417 is an apocalyptic number.

It is an amenable number.

21310417 is a deficient number, since it is larger than the sum of its proper divisors (1).

21310417 is an equidigital number, since it uses as much as digits as its factorization.

21310417 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 168, while the sum is 19.

The square root of 21310417 is about 4616.3207210938. The cubic root of 21310417 is about 277.2451660470.

Adding to 21310417 its reverse (71401312), we get a palindrome (92711729).

The spelling of 21310417 in words is "twenty-one million, three hundred ten thousand, four hundred seventeen".