21233417 has 4 divisors (see below), whose sum is σ = 21306180. Its totient is φ = 21160656.

The previous prime is 21233413. The next prime is 21233441. The reversal of 21233417 is 71433212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11095561 + 10137856 = 3331^2 + 3184^2 .

It is a cyclic number.

It is not a de Polignac number, because 21233417 - 2² = 21233413 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21233392 and 21233401.

It is not an unprimeable number, because it can be changed into a prime (21233411) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35942 + ... + 36527.

It is an arithmetic number, because the mean of its divisors is an integer number (5326545).

Almost surely, 2^21233417 is an apocalyptic number.

It is an amenable number.

21233417 is a deficient number, since it is larger than the sum of its proper divisors (72763).

21233417 is an equidigital number, since it uses as much as digits as its factorization.

21233417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72762.

The product of its digits is 1008, while the sum is 23.

The square root of 21233417 is about 4607.9731987068. The cubic root of 21233417 is about 276.9108437715.

Adding to 21233417 its reverse (71433212), we get a palindrome (92666629).

The spelling of 21233417 in words is "twenty-one million, two hundred thirty-three thousand, four hundred seventeen".