23217012 has 144 divisors (see below), whose sum is σ = 76236160. Its totient is φ = 5785344.

The previous prime is 23217011. The next prime is 23217043. The reversal of 23217012 is 21071232.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23217011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 62058 + ... + 62430.

Almost surely, 2^23217012 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 23217012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38118080).

23217012 is an abundant number, since it is smaller than the sum of its proper divisors (53019148).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

23217012 is a wasteful number, since it uses less digits than its factorization.

23217012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 422 (or 417 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 23217012 is about 4818.4034700303. The cubic root of 23217012 is about 285.2783245972.

Adding to 23217012 its reverse (21071232), we get a palindrome (44288244).

The spelling of 23217012 in words is "twenty-three million, two hundred seventeen thousand, twelve".