17172421 has 8 divisors (see below), whose sum is σ = 20479104. Its totient is φ = 14079120.

The previous prime is 17172413. The next prime is 17172427. The reversal of 17172421 is 12427171.

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

It is a cyclic number.

It is not a de Polignac number, because 17172421 - 2³ = 17172413 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 (17172427) 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, 53170 + ... + 53491.

It is an arithmetic number, because the mean of its divisors is an integer number (2559888).

Almost surely, 2^17172421 is an apocalyptic number.

It is an amenable number.

17172421 is a deficient number, since it is larger than the sum of its proper divisors (3306683).

17172421 is a wasteful number, since it uses less digits than its factorization.

17172421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106691.

The product of its digits is 784, while the sum is 25.

The square root of 17172421 is about 4143.9619930690. The cubic root of 17172421 is about 257.9945364706.

Adding to 17172421 its reverse (12427171), we get a palindrome (29599592).

The spelling of 17172421 in words is "seventeen million, one hundred seventy-two thousand, four hundred twenty-one".