21544122 has 8 divisors (see below), whose sum is σ = 43088256. Its totient is φ = 7181372.

The previous prime is 21544109. The next prime is 21544139. The reversal of 21544122 is 22144512.

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

21544122 is an admirable number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1795338 + ... + 1795349.

It is an arithmetic number, because the mean of its divisors is an integer number (5386032).

Almost surely, 2^21544122 is an apocalyptic number.

21544122 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21544122 is a wasteful number, since it uses less digits than its factorization.

21544122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3590692.

The product of its digits is 640, while the sum is 21.

The square root of 21544122 is about 4641.5646068971. The cubic root of 21544122 is about 278.2549719842.

Adding to 21544122 its reverse (22144512), we get a palindrome (43688634).

It can be divided in two parts, 2154 and 4122, that multiplied together give a palindrome (8878788).

The spelling of 21544122 in words is "twenty-one million, five hundred forty-four thousand, one hundred twenty-two".