21560422 has 16 divisors (see below), whose sum is σ = 34987680. Its totient is φ = 9905472.

The previous prime is 21560411. The next prime is 21560423. The reversal of 21560422 is 22406512.

It is a junction number, because it is equal to n+sod(n) for n = 21560393 and 21560402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21560423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4279 + ... + 7837.

It is an arithmetic number, because the mean of its divisors is an integer number (2186730).

Almost surely, 2^21560422 is an apocalyptic number.

21560422 is a deficient number, since it is larger than the sum of its proper divisors (13427258).

21560422 is a wasteful number, since it uses less digits than its factorization.

21560422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3807.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 21560422 is about 4643.3201483421. The cubic root of 21560422 is about 278.3251289808.

Adding to 21560422 its reverse (22406512), we get a palindrome (43966934).

The spelling of 21560422 in words is "twenty-one million, five hundred sixty thousand, four hundred twenty-two".