17240021 has 4 divisors (see below), whose sum is σ = 17345952. Its totient is φ = 17134092.

The previous prime is 17240009. The next prime is 17240029. The reversal of 17240021 is 12004271.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 17240021 - 2¹⁴ = 17223637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (17240029) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 52721 + ... + 53046.

It is an arithmetic number, because the mean of its divisors is an integer number (4336488).

Almost surely, 2^17240021 is an apocalyptic number.

It is an amenable number.

17240021 is a deficient number, since it is larger than the sum of its proper divisors (105931).

17240021 is a wasteful number, since it uses less digits than its factorization.

17240021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105930.

The product of its (nonzero) digits is 112, while the sum is 17.

The square root of 17240021 is about 4152.1104272406. The cubic root of 17240021 is about 258.3326288800.

Adding to 17240021 its reverse (12004271), we get a palindrome (29244292).

The spelling of 17240021 in words is "seventeen million, two hundred forty thousand, twenty-one".