21582772745 has 8 divisors (see below), whose sum is σ = 26227167360. Its totient is φ = 17047658160.

The previous prime is 21582772727. The next prime is 21582772751. The reversal of 21582772745 is 54727728512.

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

It is not a de Polignac number, because 21582772745 - 2¹⁴ = 21582756361 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21582772693 and 21582772702.

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, 27319571 + ... + 27320360.

It is an arithmetic number, because the mean of its divisors is an integer number (3278395920).

Almost surely, 2^21582772745 is an apocalyptic number.

It is an amenable number.

21582772745 is a deficient number, since it is larger than the sum of its proper divisors (4644394615).

21582772745 is an equidigital number, since it uses as much as digits as its factorization.

21582772745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54640015.

The product of its digits is 2195200, while the sum is 50.

The spelling of 21582772745 in words is "twenty-one billion, five hundred eighty-two million, seven hundred seventy-two thousand, seven hundred forty-five".