21922128 has 60 divisors (see below), whose sum is σ = 64028640. Its totient is φ = 6988608.

The previous prime is 21922123. The next prime is 21922133. The reversal of 21922128 is 82122912.

It is an interprime number because it is at equal distance from previous prime (21922123) and next prime (21922133).

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 (21922123) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3 + ... + 6621.

It is an arithmetic number, because the mean of its divisors is an integer number (1067144).

Almost surely, 2^21922128 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 21922128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32014320).

21922128 is an abundant number, since it is smaller than the sum of its proper divisors (42106512).

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

21922128 is a wasteful number, since it uses less digits than its factorization.

21922128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6656 (or 6647 counting only the distinct ones).

The product of its digits is 1152, while the sum is 27.

The square root of 21922128 is about 4682.1072179095. The cubic root of 21922128 is about 279.8729355439.

The spelling of 21922128 in words is "twenty-one million, nine hundred twenty-two thousand, one hundred twenty-eight".