21508158284 has 6 divisors (see below), whose sum is σ = 37639277004. Its totient is φ = 10754079140.

The previous prime is 21508158223. The next prime is 21508158359. The reversal of 21508158284 is 48285180512.

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 as a sum of consecutive naturals, namely, 2688519782 + ... + 2688519789.

It is an arithmetic number, because the mean of its divisors is an integer number (6273212834).

Almost surely, 2^21508158284 is an apocalyptic number.

It is an amenable number.

21508158284 is a deficient number, since it is larger than the sum of its proper divisors (16131118720).

21508158284 is a wasteful number, since it uses less digits than its factorization.

21508158284 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5377039575 (or 5377039573 counting only the distinct ones).

The product of its (nonzero) digits is 204800, while the sum is 44.

The spelling of 21508158284 in words is "twenty-one billion, five hundred eight million, one hundred fifty-eight thousand, two hundred eighty-four".