22423212 has 72 divisors (see below), whose sum is σ = 65493792. Its totient is φ = 6336000.

The previous prime is 22423207. The next prime is 22423217. The reversal of 22423212 is 21232422.

It is an interprime number because it is at equal distance from previous prime (22423207) and next prime (22423217).

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

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

It is not an unprimeable number, because it can be changed into a prime (22423217) 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, 25012 + ... + 25892.

It is an arithmetic number, because the mean of its divisors is an integer number (909636).

Almost surely, 2^22423212 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 22423212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32746896).

22423212 is an abundant number, since it is smaller than the sum of its proper divisors (43070580).

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

22423212 is a wasteful number, since it uses less digits than its factorization.

22423212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 999 (or 994 counting only the distinct ones).

The product of its digits is 384, while the sum is 18.

The square root of 22423212 is about 4735.3154066018. The cubic root of 22423212 is about 281.9892858461.

Adding to 22423212 its reverse (21232422), we get a palindrome (43655634).

It can be divided in two parts, 224 and 23212, that added together give a triangular number (23436 = T₂₁₆).

The spelling of 22423212 in words is "twenty-two million, four hundred twenty-three thousand, two hundred twelve".