21743367728825 has 12 divisors (see below), whose sum is σ = 27117624405228. Its totient is φ = 17294146814400.

The previous prime is 21743367728821. The next prime is 21743367728827. The reversal of 21743367728825 is 52882776334712.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 955795611904 + 20787572116921 = 977648^2 + 4559339^2 .

It is not a de Polignac number, because 21743367728825 - 2² = 21743367728821 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21743367728821) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2513679806 + ... + 2513688455.

It is an arithmetic number, because the mean of its divisors is an integer number (2259802033769).

Almost surely, 2^{21743367728825} is an apocalyptic number.

21743367728825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21743367728825 is a deficient number, since it is larger than the sum of its proper divisors (5374256676403).

21743367728825 is a wasteful number, since it uses less digits than its factorization.

21743367728825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5027368444 (or 5027368439 counting only the distinct ones).

The product of its digits is 189665280, while the sum is 65.

The spelling of 21743367728825 in words is "twenty-one trillion, seven hundred forty-three billion, three hundred sixty-seven million, seven hundred twenty-eight thousand, eight hundred twenty-five".