22221632 has 28 divisors (see below), whose sum is σ = 44537376. Its totient is φ = 10999680.

The previous prime is 22221599. The next prime is 22221649. The reversal of 22221632 is 23612222.

It is a hoax number, since the sum of its digits (20) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4907 + ... + 8277.

Almost surely, 2^22221632 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 22221632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22268688).

22221632 is an abundant number, since it is smaller than the sum of its proper divisors (22315744).

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

22221632 is a wasteful number, since it uses less digits than its factorization.

22221632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3486 (or 3476 counting only the distinct ones).

The product of its digits is 576, while the sum is 20.

The square root of 22221632 is about 4713.9826049743. The cubic root of 22221632 is about 281.1417326817.

Adding to 22221632 its reverse (23612222), we get a palindrome (45833854).

The spelling of 22221632 in words is "twenty-two million, two hundred twenty-one thousand, six hundred thirty-two".