21922080 has 96 divisors (see below), whose sum is σ = 69854400. Its totient is φ = 5778432.

The previous prime is 21922073. The next prime is 21922081. The reversal of 21922080 is 8022912.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 21922080.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21922081) 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, 52111 + ... + 52529.

It is an arithmetic number, because the mean of its divisors is an integer number (727650).

Almost surely, 2^21922080 is an apocalyptic number.

21922080 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21922080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34927200).

21922080 is an abundant number, since it is smaller than the sum of its proper divisors (47932320).

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

21922080 is a wasteful number, since it uses less digits than its factorization.

21922080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 546 (or 538 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 21922080 is about 4682.1020920095. The cubic root of 21922080 is about 279.8727312768.

Adding to 21922080 its reverse (8022912), we get a palindrome (29944992).

The spelling of 21922080 in words is "twenty-one million, nine hundred twenty-two thousand, eighty".