22421688 has 64 divisors (see below), whose sum is σ = 59097600. Its totient is φ = 7075200.

The previous prime is 22421677. The next prime is 22421689. The reversal of 22421688 is 88612422.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22421689) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 83218 + ... + 83486.

It is an arithmetic number, because the mean of its divisors is an integer number (923400).

Almost surely, 2^22421688 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 22421688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29548800).

22421688 is an abundant number, since it is smaller than the sum of its proper divisors (36675912).

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

22421688 is a wasteful number, since it uses less digits than its factorization.

22421688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 452 (or 448 counting only the distinct ones).

The product of its digits is 12288, while the sum is 33.

The square root of 22421688 is about 4735.1544853362. The cubic root of 22421688 is about 281.9828972073.

It can be divided in two parts, 224 and 21688, that added together give a palindrome (21912).

The spelling of 22421688 in words is "twenty-two million, four hundred twenty-one thousand, six hundred eighty-eight".