21928585 has 16 divisors (see below), whose sum is σ = 30569472. Its totient is φ = 14788800.

The previous prime is 21928579. The next prime is 21928601. The reversal of 21928585 is 58582912.

It is not a de Polignac number, because 21928585 - 2¹⁷ = 21797513 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3001 + ... + 7270.

It is an arithmetic number, because the mean of its divisors is an integer number (1910592).

Almost surely, 2^21928585 is an apocalyptic number.

It is an amenable number.

21928585 is a deficient number, since it is larger than the sum of its proper divisors (8640887).

21928585 is a wasteful number, since it uses less digits than its factorization.

21928585 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10344.

The product of its digits is 57600, while the sum is 40.

The square root of 21928585 is about 4682.7967070972. The cubic root of 21928585 is about 279.9004110115.

The spelling of 21928585 in words is "twenty-one million, nine hundred twenty-eight thousand, five hundred eighty-five".