21327173 has 8 divisors (see below), whose sum is σ = 24433920. Its totient is φ = 18235440.

The previous prime is 21327157. The next prime is 21327181. The reversal of 21327173 is 37172312.

21327173 is nontrivially palindromic in base 2.

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 21327173 - 2⁴ = 21327157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21327073) 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, 518 + ... + 6551.

It is an arithmetic number, because the mean of its divisors is an integer number (3054240).

Almost surely, 2^21327173 is an apocalyptic number.

It is an amenable number.

21327173 is a deficient number, since it is larger than the sum of its proper divisors (3106747).

21327173 is an equidigital number, since it uses as much as digits as its factorization.

21327173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7507.

The product of its digits is 1764, while the sum is 26.

The square root of 21327173 is about 4618.1352297221. The cubic root of 21327173 is about 277.3178113167.

Adding to 21327173 its reverse (37172312), we get a palindrome (58499485).

The spelling of 21327173 in words is "twenty-one million, three hundred twenty-seven thousand, one hundred seventy-three".