17442421 has 4 divisors (see below), whose sum is σ = 17450892. Its totient is φ = 17433952.

The previous prime is 17442419. The next prime is 17442431. The reversal of 17442421 is 12424471.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 11122225 + 6320196 = 3335^2 + 2514^2 .

It is a cyclic number.

It is not a de Polignac number, because 17442421 - 2¹ = 17442419 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 (17442431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1065 + ... + 6001.

It is an arithmetic number, because the mean of its divisors is an integer number (4362723).

Almost surely, 2^17442421 is an apocalyptic number.

It is an amenable number.

17442421 is a deficient number, since it is larger than the sum of its proper divisors (8471).

17442421 is an equidigital number, since it uses as much as digits as its factorization.

17442421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8470.

The product of its digits is 1792, while the sum is 25.

The square root of 17442421 is about 4176.4124556849. The cubic root of 17442421 is about 259.3396506914.

Adding to 17442421 its reverse (12424471), we get a palindrome (29866892).

It can be divided in two parts, 1744 and 2421, that multiplied together give a palindrome (4222224).

The spelling of 17442421 in words is "seventeen million, four hundred forty-two thousand, four hundred twenty-one".