17427421 has 4 divisors (see below), whose sum is σ = 19011744. Its totient is φ = 15843100.

The previous prime is 17427401. The next prime is 17427439. The reversal of 17427421 is 12472471.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12472471 = 11 ⋅1133861.

It is a cyclic number.

It is not a de Polignac number, because 17427421 - 2⁹ = 17426909 is a prime.

It is a super-2 number, since 2×17427421² = 607430005422482, which contains 22 as substring.

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 17427421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (17427401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 792145 + ... + 792166.

It is an arithmetic number, because the mean of its divisors is an integer number (4752936).

Almost surely, 2^17427421 is an apocalyptic number.

17427421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

17427421 is a deficient number, since it is larger than the sum of its proper divisors (1584323).

17427421 is a wasteful number, since it uses less digits than its factorization.

17427421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1584322.

The product of its digits is 3136, while the sum is 28.

The square root of 17427421 is about 4174.6162697906. The cubic root of 17427421 is about 259.2652877265.

Adding to 17427421 its reverse (12472471), we get a palindrome (29899892).

The spelling of 17427421 in words is "seventeen million, four hundred twenty-seven thousand, four hundred twenty-one".