21849558318 has 48 divisors (see below), whose sum is σ = 54865714176. Its totient is φ = 6154802640.

The previous prime is 21849558281. The next prime is 21849558343. The reversal of 21849558318 is 81385594812.

21849558318 is a `hidden beast` number, since 2 + 1 + 8 + 49 + 5 + 583 + 18 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1212246 + ... + 1230137.

It is an arithmetic number, because the mean of its divisors is an integer number (1143035712).

Almost surely, 2^21849558318 is an apocalyptic number.

21849558318 is an abundant number, since it is smaller than the sum of its proper divisors (33016155858).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21849558318 is a wasteful number, since it uses less digits than its factorization.

21849558318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2442469 (or 2442466 counting only the distinct ones).

The product of its digits is 2764800, while the sum is 54.

The spelling of 21849558318 in words is "twenty-one billion, eight hundred forty-nine million, five hundred fifty-eight thousand, three hundred eighteen".