21747311712 has 108 divisors (see below), whose sum is σ = 71940930516. Its totient is φ = 6213513600.

The previous prime is 21747311711. The next prime is 21747311731. The reversal of 21747311712 is 21711374712.

21747311712 is a `hidden beast` number, since 2 + 17 + 473 + 1 + 171 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21747311711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 756414 + ... + 784637.

It is an arithmetic number, because the mean of its divisors is an integer number (666119727).

Almost surely, 2^21747311712 is an apocalyptic number.

It is an amenable number.

21747311712 is an abundant number, since it is smaller than the sum of its proper divisors (50193618804).

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

21747311712 is a wasteful number, since it uses less digits than its factorization.

21747311712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1541081 (or 1541063 counting only the distinct ones).

The product of its digits is 16464, while the sum is 36.

Subtracting from 21747311712 its reverse (21711374712), we obtain a cube (35937000 = 330³).

The spelling of 21747311712 in words is "twenty-one billion, seven hundred forty-seven million, three hundred eleven thousand, seven hundred twelve".