21027548868 has 48 divisors (see below), whose sum is σ = 52393474560. Its totient is φ = 6549177600.

The previous prime is 21027548813. The next prime is 21027548869. The reversal of 21027548868 is 86884572012.

It is a super-2 number, since 2×21027548868² (a number of 21 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (51) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 21027548868.

It is not an unprimeable number, because it can be changed into a prime (21027548869) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 963793 + ... + 985368.

It is an arithmetic number, because the mean of its divisors is an integer number (1091530720).

Almost surely, 2^21027548868 is an apocalyptic number.

It is an amenable number.

21027548868 is an abundant number, since it is smaller than the sum of its proper divisors (31365925692).

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

21027548868 is a wasteful number, since it uses less digits than its factorization.

21027548868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1949228 (or 1949226 counting only the distinct ones).

The product of its (nonzero) digits is 1720320, while the sum is 51.

The spelling of 21027548868 in words is "twenty-one billion, twenty-seven million, five hundred forty-eight thousand, eight hundred sixty-eight".