21330417 has 8 divisors (see below), whose sum is σ = 28472224. Its totient is φ = 14204448.

The previous prime is 21330403. The next prime is 21330443. The reversal of 21330417 is 71403312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21330417 - 2⁸ = 21330161 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21330393 and 21330402.

It is not an unprimeable number, because it can be changed into a prime (21330467) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 343 + ... + 6540.

It is an arithmetic number, because the mean of its divisors is an integer number (3559028).

Almost surely, 2^21330417 is an apocalyptic number.

It is an amenable number.

21330417 is a deficient number, since it is larger than the sum of its proper divisors (7141807).

21330417 is a wasteful number, since it uses less digits than its factorization.

21330417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7919.

The product of its (nonzero) digits is 504, while the sum is 21.

The square root of 21330417 is about 4618.4864403828. The cubic root of 21330417 is about 277.3318712106.

Adding to 21330417 its reverse (71403312), we get a palindrome (92733729).

The spelling of 21330417 in words is "twenty-one million, three hundred thirty thousand, four hundred seventeen".