21582775445 has 72 divisors (see below), whose sum is σ = 33204780000. Its totient is φ = 13418032320.

The previous prime is 21582775421. The next prime is 21582775477. The reversal of 21582775445 is 54457728512.

It is not a de Polignac number, because 21582775445 - 2¹⁸ = 21582513301 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21582775393 and 21582775402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 14792126 + ... + 14793584.

It is an arithmetic number, because the mean of its divisors is an integer number (461177500).

Almost surely, 2^21582775445 is an apocalyptic number.

It is an amenable number.

21582775445 is a deficient number, since it is larger than the sum of its proper divisors (11622004555).

21582775445 is a wasteful number, since it uses less digits than its factorization.

21582775445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1999 (or 1981 counting only the distinct ones).

The product of its digits is 3136000, while the sum is 50.

The spelling of 21582775445 in words is "twenty-one billion, five hundred eighty-two million, seven hundred seventy-five thousand, four hundred forty-five".