27821421868 has 12 divisors (see below), whose sum is σ = 48846081592. Its totient is φ = 13865398560.

The previous prime is 27821421839. The next prime is 27821421869. The reversal of 27821421868 is 86812412872.

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (27821421869) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 11326713 + ... + 11329168.

Almost surely, 2^27821421868 is an apocalyptic number.

It is an amenable number.

27821421868 is a deficient number, since it is larger than the sum of its proper divisors (21024659724).

27821421868 is a wasteful number, since it uses less digits than its factorization.

27821421868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22656192 (or 22656190 counting only the distinct ones).

The product of its digits is 688128, while the sum is 49.

The spelling of 27821421868 in words is "twenty-seven billion, eight hundred twenty-one million, four hundred twenty-one thousand, eight hundred sixty-eight".