17072421 has 8 divisors (see below), whose sum is σ = 23247744. Its totient is φ = 11139360.

The previous prime is 17072401. The next prime is 17072423. The reversal of 17072421 is 12427071.

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

It is not a de Polignac number, because 17072421 - 2⁶ = 17072357 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 17072391 and 17072400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (17072423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60400 + ... + 60681.

It is an arithmetic number, because the mean of its divisors is an integer number (2905968).

Almost surely, 2^17072421 is an apocalyptic number.

It is an amenable number.

17072421 is a deficient number, since it is larger than the sum of its proper divisors (6175323).

17072421 is a wasteful number, since it uses less digits than its factorization.

17072421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121131.

The product of its (nonzero) digits is 784, while the sum is 24.

The square root of 17072421 is about 4131.8786284207. The cubic root of 17072421 is about 257.4927688295.

Adding to 17072421 its reverse (12427071), we get a palindrome (29499492).

The spelling of 17072421 in words is "seventeen million, seventy-two thousand, four hundred twenty-one".