23217321 has 8 divisors (see below), whose sum is σ = 31117600. Its totient is φ = 15397632.

The previous prime is 23217301. The next prime is 23217331. The reversal of 23217321 is 12371232.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 23217321 - 2¹³ = 23209129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23217301) 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, 19471 + ... + 20628.

It is an arithmetic number, because the mean of its divisors is an integer number (3889700).

Almost surely, 2^23217321 is an apocalyptic number.

It is an amenable number.

23217321 is a deficient number, since it is larger than the sum of its proper divisors (7900279).

23217321 is a wasteful number, since it uses less digits than its factorization.

23217321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40295.

The product of its digits is 504, while the sum is 21.

The square root of 23217321 is about 4818.4355344863. The cubic root of 23217321 is about 285.2795902009.

Adding to 23217321 its reverse (12371232), we get a palindrome (35588553).

The spelling of 23217321 in words is "twenty-three million, two hundred seventeen thousand, three hundred twenty-one".