21584309486 has 24 divisors (see below), whose sum is σ = 34070510520. Its totient is φ = 10243305296.

The previous prime is 21584309449. The next prime is 21584309507. The reversal of 21584309486 is 68490348512.

It is a hoax number, since the sum of its digits (50) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 148445 + ... + 255351.

It is an arithmetic number, because the mean of its divisors is an integer number (1419604605).

Almost surely, 2^21584309486 is an apocalyptic number.

21584309486 is a deficient number, since it is larger than the sum of its proper divisors (12486201034).

21584309486 is a wasteful number, since it uses less digits than its factorization.

21584309486 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107056 (or 106997 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 50.

The spelling of 21584309486 in words is "twenty-one billion, five hundred eighty-four million, three hundred nine thousand, four hundred eighty-six".