21163271 has 8 divisors (see below), whose sum is σ = 21636720. Its totient is φ = 20692672.

The previous prime is 21163253. The next prime is 21163291. The reversal of 21163271 is 17236112.

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 21163271 - 2¹⁰ = 21162247 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21163201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21731 + ... + 22683.

It is an arithmetic number, because the mean of its divisors is an integer number (2704590).

Almost surely, 2^21163271 is an apocalyptic number.

21163271 is a deficient number, since it is larger than the sum of its proper divisors (473449).

21163271 is an equidigital number, since it uses as much as digits as its factorization.

21163271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1425.

The product of its digits is 504, while the sum is 23.

The square root of 21163271 is about 4600.3555297390. The cubic root of 21163271 is about 276.6055762603.

Adding to 21163271 its reverse (17236112), we get a palindrome (38399383).

The spelling of 21163271 in words is "twenty-one million, one hundred sixty-three thousand, two hundred seventy-one".