21082459204 has 27 divisors (see below), whose sum is σ = 38948502621. Its totient is φ = 9983814480.

The previous prime is 21082459201. The next prime is 21082459219. The reversal of 21082459204 is 40295428012.

The square root of 21082459204 is 145198.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 18933209604 + 2149249600 = 137598^2 + 46360^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21082459201) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 5515614 + ... + 5519434.

Almost surely, 2^21082459204 is an apocalyptic number.

21082459204 is the 145198-th square number.

It is an amenable number.

21082459204 is a deficient number, since it is larger than the sum of its proper divisors (17866043417).

21082459204 is an frugal number, since it uses more digits than its factorization.

21082459204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7684 (or 3842 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 37.

The spelling of 21082459204 in words is "twenty-one billion, eighty-two million, four hundred fifty-nine thousand, two hundred four".