21224444444 has 48 divisors (see below), whose sum is σ = 45194385600. Its totient is φ = 8513786880.

The previous prime is 21224444443. The next prime is 21224444467. The reversal of 21224444444 is 44444442212.

It is a nude number because it is divisible by every one of its digits.

21224444444 is a modest number, since divided by 444444 gives 21224 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21224444441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37019 + ... + 209330.

It is an arithmetic number, because the mean of its divisors is an integer number (941549700).

Almost surely, 2^21224444444 is an apocalyptic number.

It is an amenable number.

21224444444 is an abundant number, since it is smaller than the sum of its proper divisors (23969941156).

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

21224444444 is a wasteful number, since it uses less digits than its factorization.

21224444444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246558 (or 246556 counting only the distinct ones).

The product of its digits is 131072, while the sum is 35.

Adding to 21224444444 its reverse (44444442212), we get a palindrome (65668886656).

The spelling of 21224444444 in words is "twenty-one billion, two hundred twenty-four million, four hundred forty-four thousand, four hundred forty-four".