21422176 has 48 divisors (see below), whose sum is σ = 45559584. Its totient is φ = 9877504.

The previous prime is 21422143. The next prime is 21422221. The reversal of 21422176 is 67122412.

It is a self number, because there is not a number n which added to its sum of digits gives 21422176.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28461 + ... + 29203.

It is an arithmetic number, because the mean of its divisors is an integer number (949158).

Almost surely, 2^21422176 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 21422176, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22779792).

21422176 is an abundant number, since it is smaller than the sum of its proper divisors (24137408).

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

21422176 is a wasteful number, since it uses less digits than its factorization.

21422176 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 823 (or 815 counting only the distinct ones).

The product of its digits is 1344, while the sum is 25.

The square root of 21422176 is about 4628.4096620762. The cubic root of 21422176 is about 277.7289769322.

Adding to 21422176 its reverse (67122412), we get a palindrome (88544588).

The spelling of 21422176 in words is "twenty-one million, four hundred twenty-two thousand, one hundred seventy-six".