21922560 has 216 divisors, whose sum is σ = 83223504. Its totient is φ = 5283840.

The previous prime is 21922559. The next prime is 21922573. The reversal of 21922560 is 6522912.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 126634 + ... + 126806.

It is an arithmetic number, because the mean of its divisors is an integer number (385294).

Almost surely, 2^21922560 is an apocalyptic number.

21922560 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 21922560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41611752).

21922560 is an abundant number, since it is smaller than the sum of its proper divisors (61300944).

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

21922560 is a wasteful number, since it uses less digits than its factorization.

21922560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211 (or 194 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 21922560 is about 4682.1533507565. The cubic root of 21922560 is about 279.8747739347.

The spelling of 21922560 in words is "twenty-one million, nine hundred twenty-two thousand, five hundred sixty".