21103171 has 8 divisors (see below), whose sum is σ = 22399200. Its totient is φ = 19813248.

The previous prime is 21103139. The next prime is 21103177. The reversal of 21103171 is 17130112.

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 21103171 - 2⁵ = 21103139 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21103177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7005 + ... + 9553.

It is an arithmetic number, because the mean of its divisors is an integer number (2799900).

Almost surely, 2^21103171 is an apocalyptic number.

21103171 is a deficient number, since it is larger than the sum of its proper divisors (1296029).

21103171 is a wasteful number, since it uses less digits than its factorization.

21103171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3053.

The product of its (nonzero) digits is 42, while the sum is 16.

The square root of 21103171 is about 4593.8187817980. The cubic root of 21103171 is about 276.3434908069.

Adding to 21103171 its reverse (17130112), we get a palindrome (38233283).

The spelling of 21103171 in words is "twenty-one million, one hundred three thousand, one hundred seventy-one".