23215 has 4 divisors (see below), whose sum is σ = 27864. Its totient is φ = 18568.

The previous prime is 23209. The next prime is 23227. The reversal of 23215 is 51232.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 23215 - 2⁷ = 23087 is a prime.

It is a d-powerful number, because it can be written as 2² + 3⁸ + 2¹⁰ + 1 + 5⁶ .

It is a Duffinian number.

It is a plaindrome in base 4 and base 16.

It is a nialpdrome in base 14.

It is a zygodrome in base 4.

It is a junction number, because it is equal to n+sod(n) for n = 23195 and 23204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2317 + ... + 2326.

It is an arithmetic number, because the mean of its divisors is an integer number (6966).

2²³²¹⁵ is an apocalyptic number.

23215 is a deficient number, since it is larger than the sum of its proper divisors (4649).

23215 is an equidigital number, since it uses as much as digits as its factorization.

23215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4648.

The product of its digits is 60, while the sum is 13.

The square root of 23215 is about 152.3646940731. The cubic root of 23215 is about 28.5270083563.

Adding to 23215 its reverse (51232), we get a palindrome (74447).

The spelling of 23215 in words is "twenty-three thousand, two hundred fifteen".