21304472444 has 12 divisors (see below), whose sum is σ = 37283954568. Its totient is φ = 10651914000.

The previous prime is 21304472443. The next prime is 21304472447. The reversal of 21304472444 is 44427440312.

It is a super-2 number, since 2×21304472444² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21304472443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 128474 + ... + 243134.

It is an arithmetic number, because the mean of its divisors is an integer number (3106996214).

Almost surely, 2^21304472444 is an apocalyptic number.

It is an amenable number.

21304472444 is a deficient number, since it is larger than the sum of its proper divisors (15979482124).

21304472444 is a wasteful number, since it uses less digits than its factorization.

21304472444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161116 (or 161114 counting only the distinct ones).

The product of its (nonzero) digits is 86016, while the sum is 35.

The spelling of 21304472444 in words is "twenty-one billion, three hundred four million, four hundred seventy-two thousand, four hundred forty-four".