21441550 has 24 divisors (see below), whose sum is σ = 42950376. Its totient is φ = 7916640.

The previous prime is 21441533. The next prime is 21441551. The reversal of 21441550 is 5514412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21441551) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 15844 + ... + 17143.

It is an arithmetic number, because the mean of its divisors is an integer number (1789599).

Almost surely, 2^21441550 is an apocalyptic number.

21441550 is an abundant number, since it is smaller than the sum of its proper divisors (21508826).

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

21441550 is a wasteful number, since it uses less digits than its factorization.

21441550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33012 (or 33007 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 21441550 is about 4630.5021325986. The cubic root of 21441550 is about 277.8126768004.

Adding to 21441550 its reverse (5514412), we get a palindrome (26955962).

The spelling of 21441550 in words is "twenty-one million, four hundred forty-one thousand, five hundred fifty".