21417327 has 6 divisors (see below), whose sum is σ = 30936152. Its totient is φ = 14278212.

The previous prime is 21417323. The next prime is 21417329. The reversal of 21417327 is 72371412.

It is a happy number.

It is not a de Polignac number, because 21417327 - 2² = 21417323 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21417327.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21417323) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1189843 + ... + 1189860.

Almost surely, 2^21417327 is an apocalyptic number.

21417327 is a deficient number, since it is larger than the sum of its proper divisors (9518825).

21417327 is a wasteful number, since it uses less digits than its factorization.

21417327 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2379709 (or 2379706 counting only the distinct ones).

The product of its digits is 2352, while the sum is 27.

The square root of 21417327 is about 4627.8858023940. The cubic root of 21417327 is about 277.7080203087.

Adding to 21417327 its reverse (72371412), we get a palindrome (93788739).

The spelling of 21417327 in words is "twenty-one million, four hundred seventeen thousand, three hundred twenty-seven".