21440300550 has 48 divisors (see below), whose sum is σ = 56299713552. Its totient is φ = 5381094400.

The previous prime is 21440300543. The next prime is 21440300573. The reversal of 21440300550 is 5500304412.

It is a self number, because there is not a number n which added to its sum of digits gives 21440300550.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4201431 + ... + 4206530.

It is an arithmetic number, because the mean of its divisors is an integer number (1172910699).

Almost surely, 2^21440300550 is an apocalyptic number.

21440300550 is an abundant number, since it is smaller than the sum of its proper divisors (34859413002).

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

21440300550 is a wasteful number, since it uses less digits than its factorization.

21440300550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8407993 (or 8407988 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 24.

Adding to 21440300550 its reverse (5500304412), we get a palindrome (26940604962).

The spelling of 21440300550 in words is "twenty-one billion, four hundred forty million, three hundred thousand, five hundred fifty".