21543654304 has 48 divisors (see below), whose sum is σ = 42851115720. Its totient is φ = 10661109760.

The previous prime is 21543654289. The next prime is 21543654359. The reversal of 21543654304 is 40345634512.

It can be written as a sum of positive squares in 4 ways, for example, as 1611861904 + 19931792400 = 40148^2 + 141180^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2747862 + ... + 2755690.

Almost surely, 2^21543654304 is an apocalyptic number.

It is an amenable number.

21543654304 is a deficient number, since it is larger than the sum of its proper divisors (21307461416).

21543654304 is a wasteful number, since it uses less digits than its factorization.

21543654304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8713 (or 8705 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 37.

The spelling of 21543654304 in words is "twenty-one billion, five hundred forty-three million, six hundred fifty-four thousand, three hundred four".