21642544304 has 10 divisors (see below), whose sum is σ = 41932429620. Its totient is φ = 10821272144.

The previous prime is 21642544291. The next prime is 21642544361. The reversal of 21642544304 is 40344524612.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 676329494 + ... + 676329525.

It is an arithmetic number, because the mean of its divisors is an integer number (4193242962).

Almost surely, 2^21642544304 is an apocalyptic number.

It is an amenable number.

21642544304 is a deficient number, since it is larger than the sum of its proper divisors (20289885316).

21642544304 is a wasteful number, since it uses less digits than its factorization.

21642544304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1352659027 (or 1352659021 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 35.

The spelling of 21642544304 in words is "twenty-one billion, six hundred forty-two million, five hundred forty-four thousand, three hundred four".