21221330044 has 12 divisors (see below), whose sum is σ = 39321876384. Its totient is φ = 9986508224.

The previous prime is 21221329967. The next prime is 21221330063. The reversal of 21221330044 is 44003312212.

It is a junction number, because it is equal to n+sod(n) for n = 21221329997 and 21221330024.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 156039124 + ... + 156039259.

It is an arithmetic number, because the mean of its divisors is an integer number (3276823032).

Almost surely, 2^21221330044 is an apocalyptic number.

It is an amenable number.

21221330044 is a deficient number, since it is larger than the sum of its proper divisors (18100546340).

21221330044 is a wasteful number, since it uses less digits than its factorization.

21221330044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312078404 (or 312078402 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 21221330044 its reverse (44003312212), we get a palindrome (65224642256).

The spelling of 21221330044 in words is "twenty-one billion, two hundred twenty-one million, three hundred thirty thousand, forty-four".