23421216 has 144 divisors (see below), whose sum is σ = 77220864. Its totient is φ = 6160896.

The previous prime is 23421173. The next prime is 23421217. The reversal of 23421216 is 61212432.

It is a Harshad number since it is a multiple of its sum of digits (21).

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

It is a junction number, because it is equal to n+sod(n) for n = 23421192 and 23421201.

It is not an unprimeable number, because it can be changed into a prime (23421217) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 60961 + ... + 61343.

It is an arithmetic number, because the mean of its divisors is an integer number (536256).

Almost surely, 2^23421216 is an apocalyptic number.

23421216 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 23421216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38610432).

23421216 is an abundant number, since it is smaller than the sum of its proper divisors (53799648).

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

23421216 is a wasteful number, since it uses less digits than its factorization.

23421216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 423 (or 408 counting only the distinct ones).

The product of its digits is 576, while the sum is 21.

The square root of 23421216 is about 4839.5470862468. The cubic root of 23421216 is about 286.1122678545.

Adding to 23421216 its reverse (61212432), we get a palindrome (84633648).

The spelling of 23421216 in words is "twenty-three million, four hundred twenty-one thousand, two hundred sixteen".