21327288544 has 48 divisors (see below), whose sum is σ = 42263182080. Its totient is φ = 10594017280.

The previous prime is 21327288539. The next prime is 21327288617. The reversal of 21327288544 is 44588272312.

It is a junction number, because it is equal to n+sod(n) for n = 21327288494 and 21327288503.

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 7 ways as a sum of consecutive naturals, for example, 3170817 + ... + 3177535.

It is an arithmetic number, because the mean of its divisors is an integer number (880482960).

Almost surely, 2^21327288544 is an apocalyptic number.

It is an amenable number.

21327288544 is a deficient number, since it is larger than the sum of its proper divisors (20935893536).

21327288544 is a wasteful number, since it uses less digits than its factorization.

21327288544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7363 (or 7355 counting only the distinct ones).

The product of its digits is 860160, while the sum is 46.

The spelling of 21327288544 in words is "twenty-one billion, three hundred twenty-seven million, two hundred eighty-eight thousand, five hundred forty-four".