21501543304 has 16 divisors (see below), whose sum is σ = 41404999500. Its totient is φ = 10460210112.

The previous prime is 21501543293. The next prime is 21501543383. The reversal of 21501543304 is 40334510512.

It can be written as a sum of positive squares in 2 ways, for example, as 19543480804 + 1958062500 = 139798^2 + 44250^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36319879 + ... + 36320470.

Almost surely, 2^21501543304 is an apocalyptic number.

It is an amenable number.

21501543304 is a deficient number, since it is larger than the sum of its proper divisors (19903456196).

21501543304 is a wasteful number, since it uses less digits than its factorization.

21501543304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72640392 (or 72640388 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 28.

The spelling of 21501543304 in words is "twenty-one billion, five hundred one million, five hundred forty-three thousand, three hundred four".