21922760 has 16 divisors (see below), whose sum is σ = 49326300. Its totient is φ = 8769088.

The previous prime is 21922739. The next prime is 21922763. The reversal of 21922760 is 6722912.

It can be written as a sum of positive squares in 2 ways, for example, as 20811844 + 1110916 = 4562^2 + 1054^2 .

It is not an unprimeable number, because it can be changed into a prime (21922763) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 273995 + ... + 274074.

Almost surely, 2^21922760 is an apocalyptic number.

21922760 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21922760 is an abundant number, since it is smaller than the sum of its proper divisors (27403540).

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

21922760 is a wasteful number, since it uses less digits than its factorization.

21922760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 548080 (or 548076 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 21922760 is about 4682.1747084021. The cubic root of 21922760 is about 279.8756250334.

The spelling of 21922760 in words is "twenty-one million, nine hundred twenty-two thousand, seven hundred sixty".