21726574543560 has 256 divisors, whose sum is σ = 72912634444800. Its totient is φ = 5152891584512.

The previous prime is 21726574543547. The next prime is 21726574543613. The reversal of 21726574543560 is 6534547562712.

It is a self number, because there is not a number n which added to its sum of digits gives 21726574543560.

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 63 ways as a sum of consecutive naturals, for example, 1126407 + ... + 6687446.

It is an arithmetic number, because the mean of its divisors is an integer number (284814978300).

Almost surely, 2^{21726574543560} is an apocalyptic number.

21726574543560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21726574543560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36456317222400).

21726574543560 is an abundant number, since it is smaller than the sum of its proper divisors (51186059901240).

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

21726574543560 is a wasteful number, since it uses less digits than its factorization.

21726574543560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7813960 (or 7813956 counting only the distinct ones).

The product of its (nonzero) digits is 42336000, while the sum is 57.

The spelling of 21726574543560 in words is "twenty-one trillion, seven hundred twenty-six billion, five hundred seventy-four million, five hundred forty-three thousand, five hundred sixty".