23213217 has 4 divisors (see below), whose sum is σ = 30950960. Its totient is φ = 15475476.

The previous prime is 23213209. The next prime is 23213219. The reversal of 23213217 is 71231232.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 23213217 - 2³ = 23213209 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23213193 and 23213202.

It is not an unprimeable number, because it can be changed into a prime (23213219) 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, 3868867 + ... + 3868872.

It is an arithmetic number, because the mean of its divisors is an integer number (7737740).

It is a self-describing number.

Almost surely, 2^23213217 is an apocalyptic number.

It is an amenable number.

23213217 is a deficient number, since it is larger than the sum of its proper divisors (7737743).

23213217 is an equidigital number, since it uses as much as digits as its factorization.

23213217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7737742.

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

The square root of 23213217 is about 4818.0096512979. The cubic root of 23213217 is about 285.2627801014.

Adding to 23213217 its reverse (71231232), we get a palindrome (94444449).

The spelling of 23213217 in words is "twenty-three million, two hundred thirteen thousand, two hundred seventeen".