23181216 has 96 divisors (see below), whose sum is σ = 65318400. Its totient is φ = 7176960.

The previous prime is 23181209. The next prime is 23181233. The reversal of 23181216 is 61218132.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 129415 + ... + 129593.

It is an arithmetic number, because the mean of its divisors is an integer number (680400).

Almost surely, 2^23181216 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 23181216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32659200).

23181216 is an abundant number, since it is smaller than the sum of its proper divisors (42137184).

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

23181216 is a wasteful number, since it uses less digits than its factorization.

23181216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282 (or 274 counting only the distinct ones).

The product of its digits is 576, while the sum is 24.

The square root of 23181216 is about 4814.6875288018. The cubic root of 23181216 is about 285.1316350978.

Adding to 23181216 its reverse (61218132), we get a palindrome (84399348).

The spelling of 23181216 in words is "twenty-three million, one hundred eighty-one thousand, two hundred sixteen".