21550044244 has 6 divisors (see below), whose sum is σ = 37712577434. Its totient is φ = 10775022120.

The previous prime is 21550044223. The next prime is 21550044247. The reversal of 21550044244 is 44244005512.

It can be written as a sum of positive squares in only one way, i.e., 19435148100 + 2114896144 = 139410^2 + 45988^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21550044247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2693755527 + ... + 2693755534.

Almost surely, 2^21550044244 is an apocalyptic number.

It is an amenable number.

21550044244 is a deficient number, since it is larger than the sum of its proper divisors (16162533190).

21550044244 is a wasteful number, since it uses less digits than its factorization.

21550044244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5387511065 (or 5387511063 counting only the distinct ones).

The product of its (nonzero) digits is 25600, while the sum is 31.

Adding to 21550044244 its reverse (44244005512), we get a palindrome (65794049756).

The spelling of 21550044244 in words is "twenty-one billion, five hundred fifty million, forty-four thousand, two hundred forty-four".