17290421 has 2 divisors, whose sum is σ = 17290422. Its totient is φ = 17290420.

The previous prime is 17290393. The next prime is 17290423. The reversal of 17290421 is 12409271.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12859396 + 4431025 = 3586^2 + 2105^2 .

It is a cyclic number.

It is not a de Polignac number, because 17290421 - 2²² = 13096117 is a prime.

Together with 17290423, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_1108691 and since 17290421 and 1108691 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (17290423) 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 as a sum of consecutive naturals, namely, 8645210 + 8645211.

It is an arithmetic number, because the mean of its divisors is an integer number (8645211).

Almost surely, 2^17290421 is an apocalyptic number.

It is an amenable number.

17290421 is a deficient number, since it is larger than the sum of its proper divisors (1).

17290421 is an equidigital number, since it uses as much as digits as its factorization.

17290421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 17290421 is about 4158.1752007341. The cubic root of 17290421 is about 258.5841231098.

Adding to 17290421 its reverse (12409271), we get a palindrome (29699692).

The spelling of 17290421 in words is "seventeen million, two hundred ninety thousand, four hundred twenty-one".