21430171 has 8 divisors (see below), whose sum is σ = 24572384. Its totient is φ = 18308160.

The previous prime is 21430169. The next prime is 21430177. The reversal of 21430171 is 17103412.

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 21430171 - 2¹ = 21430169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21430177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2700 + ... + 7081.

It is an arithmetic number, because the mean of its divisors is an integer number (3071548).

Almost surely, 2^21430171 is an apocalyptic number.

21430171 is a deficient number, since it is larger than the sum of its proper divisors (3142213).

21430171 is an equidigital number, since it uses as much as digits as its factorization.

21430171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10101.

The product of its (nonzero) digits is 168, while the sum is 19.

The square root of 21430171 is about 4629.2732690996. The cubic root of 21430171 is about 277.7635231737.

Adding to 21430171 its reverse (17103412), we get a palindrome (38533583).

The spelling of 21430171 in words is "twenty-one million, four hundred thirty thousand, one hundred seventy-one".