21587945582 has 12 divisors (see below), whose sum is σ = 37668762360. Its totient is φ = 9251976636.

The previous prime is 21587945557. The next prime is 21587945611. The reversal of 21587945582 is 28554978512.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 110142482 + ... + 110142677.

It is an arithmetic number, because the mean of its divisors is an integer number (3139063530).

Almost surely, 2^21587945582 is an apocalyptic number.

21587945582 is a deficient number, since it is larger than the sum of its proper divisors (16080816778).

21587945582 is a wasteful number, since it uses less digits than its factorization.

21587945582 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220285175 (or 220285168 counting only the distinct ones).

The product of its digits is 8064000, while the sum is 56.

The spelling of 21587945582 in words is "twenty-one billion, five hundred eighty-seven million, nine hundred forty-five thousand, five hundred eighty-two".