21582395073 has 12 divisors (see below), whose sum is σ = 31222319700. Its totient is φ = 14366225376.

The previous prime is 21582395063. The next prime is 21582395099. The reversal of 21582395073 is 37059328512.

It can be written as a sum of positive squares in 2 ways, for example, as 10316058624 + 11266336449 = 101568^2 + 106143^2 .

It is not a de Polignac number, because 21582395073 - 2⁴ = 21582395057 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21582395063) 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, 1830298 + ... + 1842051.

It is an arithmetic number, because the mean of its divisors is an integer number (2601859975).

Almost surely, 2^21582395073 is an apocalyptic number.

It is an amenable number.

21582395073 is a deficient number, since it is larger than the sum of its proper divisors (9639924627).

21582395073 is a wasteful number, since it uses less digits than its factorization.

21582395073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3673008 (or 3673005 counting only the distinct ones).

The product of its (nonzero) digits is 453600, while the sum is 45.

The spelling of 21582395073 in words is "twenty-one billion, five hundred eighty-two million, three hundred ninety-five thousand, seventy-three".