21444442284 has 12 divisors (see below), whose sum is σ = 50037032024. Its totient is φ = 7148147424.

The previous prime is 21444442273. The next prime is 21444442291. The reversal of 21444442284 is 48224444412.

It is a tau number, because it is divible by the number of its divisors (12).

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 3 ways as a sum of consecutive naturals, for example, 893518417 + ... + 893518440.

Almost surely, 2^21444442284 is an apocalyptic number.

It is an amenable number.

21444442284 is an abundant number, since it is smaller than the sum of its proper divisors (28592589740).

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

21444442284 is a wasteful number, since it uses less digits than its factorization.

21444442284 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1787036864 (or 1787036862 counting only the distinct ones).

The product of its digits is 262144, while the sum is 39.

Adding to 21444442284 its reverse (48224444412), we get a palindrome (69668886696).

The spelling of 21444442284 in words is "twenty-one billion, four hundred forty-four million, four hundred forty-two thousand, two hundred eighty-four".