21508832084 has 12 divisors (see below), whose sum is σ = 38278430400. Its totient is φ = 10572137688.

The previous prime is 21508832077. The next prime is 21508832153. The reversal of 21508832084 is 48023880512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45569324 + ... + 45569795.

It is an arithmetic number, because the mean of its divisors is an integer number (3189869200).

Almost surely, 2^21508832084 is an apocalyptic number.

It is an amenable number.

21508832084 is a deficient number, since it is larger than the sum of its proper divisors (16769598316).

21508832084 is a wasteful number, since it uses less digits than its factorization.

21508832084 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91139182 (or 91139180 counting only the distinct ones).

The product of its (nonzero) digits is 122880, while the sum is 41.

The spelling of 21508832084 in words is "twenty-one billion, five hundred eight million, eight hundred thirty-two thousand, eighty-four".