23171321 has 4 divisors (see below), whose sum is σ = 23182500. Its totient is φ = 23160144.

The previous prime is 23171299. The next prime is 23171339. The reversal of 23171321 is 12317132.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 3279721 + 19891600 = 1811^2 + 4460^2 .

It is a cyclic number.

It is not a de Polignac number, because 23171321 - 2¹⁸ = 22909177 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 23171293 and 23171302.

It is not an unprimeable number, because it can be changed into a prime (23171341) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1466 + ... + 6963.

It is an arithmetic number, because the mean of its divisors is an integer number (5795625).

Almost surely, 2^23171321 is an apocalyptic number.

It is an amenable number.

23171321 is a deficient number, since it is larger than the sum of its proper divisors (11179).

23171321 is an equidigital number, since it uses as much as digits as its factorization.

23171321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11178.

The product of its digits is 252, while the sum is 20.

The square root of 23171321 is about 4813.6598342633. The cubic root of 23171321 is about 285.0910594429.

Adding to 23171321 its reverse (12317132), we get a palindrome (35488453).

The spelling of 23171321 in words is "twenty-three million, one hundred seventy-one thousand, three hundred twenty-one".