21417330 has 32 divisors (see below), whose sum is σ = 56075328. Its totient is φ = 5192000.

The previous prime is 21417329. The next prime is 21417343. The reversal of 21417330 is 3371412.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21417297 and 21417306.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32121 + ... + 32780.

It is an arithmetic number, because the mean of its divisors is an integer number (1752354).

Almost surely, 2^21417330 is an apocalyptic number.

21417330 is an abundant number, since it is smaller than the sum of its proper divisors (34657998).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21417330 is a wasteful number, since it uses less digits than its factorization.

21417330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64922.

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

The square root of 21417330 is about 4627.8861265161. The cubic root of 21417330 is about 277.7080332752.

Adding to 21417330 its reverse (3371412), we get a palindrome (24788742).

The spelling of 21417330 in words is "twenty-one million, four hundred seventeen thousand, three hundred thirty".