21544226 has 8 divisors (see below), whose sum is σ = 35254224. Its totient is φ = 9792820.

The previous prime is 21544217. The next prime is 21544231. The reversal of 21544226 is 62244512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21544195 and 21544204.

It is an unprimeable number.

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, 489620 + ... + 489663.

It is an arithmetic number, because the mean of its divisors is an integer number (4406778).

Almost surely, 2^21544226 is an apocalyptic number.

21544226 is a deficient number, since it is larger than the sum of its proper divisors (13709998).

21544226 is a wasteful number, since it uses less digits than its factorization.

21544226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 979296.

The product of its digits is 3840, while the sum is 26.

The square root of 21544226 is about 4641.5758100025. The cubic root of 21544226 is about 278.2554197239.

Adding to 21544226 its reverse (62244512), we get a palindrome (83788738).

The spelling of 21544226 in words is "twenty-one million, five hundred forty-four thousand, two hundred twenty-six".