21840573745 has 8 divisors (see below), whose sum is σ = 26503168680. Its totient is φ = 17276138880.

The previous prime is 21840573737. The next prime is 21840573751. The reversal of 21840573745 is 54737504812.

It can be written as a sum of positive squares in 4 ways, for example, as 206870689 + 21633703056 = 14383^2 + 147084^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21840573745 - 2³ = 21840573737 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21840573695 and 21840573704.

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, 24539526 + ... + 24540415.

It is an arithmetic number, because the mean of its divisors is an integer number (3312896085).

Almost surely, 2^21840573745 is an apocalyptic number.

It is an amenable number.

21840573745 is a deficient number, since it is larger than the sum of its proper divisors (4662594935).

21840573745 is an equidigital number, since it uses as much as digits as its factorization.

21840573745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49080035.

The product of its (nonzero) digits is 940800, while the sum is 46.

The spelling of 21840573745 in words is "twenty-one billion, eight hundred forty million, five hundred seventy-three thousand, seven hundred forty-five".