21441436 has 6 divisors (see below), whose sum is σ = 37522520. Its totient is φ = 10720716.

The previous prime is 21441421. The next prime is 21441449. The reversal of 21441436 is 63414412.

It is a self number, because there is not a number n which added to its sum of digits gives 21441436.

It is a congruent 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 as a sum of consecutive naturals, namely, 2680176 + ... + 2680183.

Almost surely, 2^21441436 is an apocalyptic number.

It is an amenable number.

21441436 is a deficient number, since it is larger than the sum of its proper divisors (16081084).

21441436 is a wasteful number, since it uses less digits than its factorization.

21441436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5360363 (or 5360361 counting only the distinct ones).

The product of its digits is 2304, while the sum is 25.

The square root of 21441436 is about 4630.4898229021. The cubic root of 21441436 is about 277.8121844433.

Adding to 21441436 its reverse (63414412), we get a palindrome (84855848).

The spelling of 21441436 in words is "twenty-one million, four hundred forty-one thousand, four hundred thirty-six".