21073171 has 16 divisors (see below), whose sum is σ = 24883200. Its totient is φ = 17473248.

The previous prime is 21073159. The next prime is 21073177. The reversal of 21073171 is 17137012.

It is a cyclic number.

It is not a de Polignac number, because 21073171 - 2⁹ = 21072659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21073177) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28950 + ... + 29668.

It is an arithmetic number, because the mean of its divisors is an integer number (1555200).

Almost surely, 2^21073171 is an apocalyptic number.

21073171 is a deficient number, since it is larger than the sum of its proper divisors (3810029).

21073171 is an equidigital number, since it uses as much as digits as its factorization.

21073171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 858.

The product of its (nonzero) digits is 294, while the sum is 22.

The square root of 21073171 is about 4590.5523632783. The cubic root of 21073171 is about 276.2124799066.

The spelling of 21073171 in words is "twenty-one million, seventy-three thousand, one hundred seventy-one".