21433417 has 2 divisors, whose sum is σ = 21433418. Its totient is φ = 21433416.

The previous prime is 21433361. The next prime is 21433421. The reversal of 21433417 is 71433412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21427641 + 5776 = 4629^2 + 76^2 .

It is a cyclic number.

It is not a de Polignac number, because 21433417 - 2⁷ = 21433289 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21433391 and 21433400.

It is not a weakly prime, because it can be changed into another prime (21433427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10716708 + 10716709.

It is an arithmetic number, because the mean of its divisors is an integer number (10716709).

Almost surely, 2^21433417 is an apocalyptic number.

It is an amenable number.

21433417 is a deficient number, since it is larger than the sum of its proper divisors (1).

21433417 is an equidigital number, since it uses as much as digits as its factorization.

21433417 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2016, while the sum is 25.

The square root of 21433417 is about 4629.6238508112. The cubic root of 21433417 is about 277.7775466250. Note that the first 3 decimals are identical.

Adding to 21433417 its reverse (71433412), we get a palindrome (92866829).

The spelling of 21433417 in words is "twenty-one million, four hundred thirty-three thousand, four hundred seventeen".