21304054444 has 12 divisors (see below), whose sum is σ = 38191414968. Its totient is φ = 10392221600.

The previous prime is 21304054433. The next prime is 21304054477. The reversal of 21304054444 is 44445040312.

It is a super-2 number, since 2×21304054444² (a number of 21 digits) contains 22 as substring.

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, 64951222 + ... + 64951549.

It is an arithmetic number, because the mean of its divisors is an integer number (3182617914).

Almost surely, 2^21304054444 is an apocalyptic number.

It is an amenable number.

21304054444 is a deficient number, since it is larger than the sum of its proper divisors (16887360524).

21304054444 is a wasteful number, since it uses less digits than its factorization.

21304054444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129902816 (or 129902814 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 31.

Adding to 21304054444 its reverse (44445040312), we get a palindrome (65749094756).

The spelling of 21304054444 in words is "twenty-one billion, three hundred four million, fifty-four thousand, four hundred forty-four".