21559422 has 16 divisors (see below), whose sum is σ = 43178112. Its totient is φ = 7176600.

The previous prime is 21559409. The next prime is 21559423. The reversal of 21559422 is 22495512.

It is a self number, because there is not a number n which added to its sum of digits gives 21559422.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21559423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3297 + ... + 7347.

It is an arithmetic number, because the mean of its divisors is an integer number (2698632).

Almost surely, 2^21559422 is an apocalyptic number.

21559422 is an abundant number, since it is smaller than the sum of its proper divisors (21618690).

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

21559422 is a wasteful number, since it uses less digits than its factorization.

21559422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4943.

The product of its digits is 7200, while the sum is 30.

The square root of 21559422 is about 4643.2124655243. The cubic root of 21559422 is about 278.3208258889.

The spelling of 21559422 in words is "twenty-one million, five hundred fifty-nine thousand, four hundred twenty-two".