21908600545 has 16 divisors (see below), whose sum is σ = 28459366992. Its totient is φ = 16094822400.

The previous prime is 21908600521. The next prime is 21908600563. The reversal of 21908600545 is 54500680912.

It can be written as a sum of positive squares in 8 ways, for example, as 6235313296 + 15673287249 = 78964^2 + 125193^2 .

It is not a de Polignac number, because 21908600545 - 2²¹ = 21906503393 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21908600498 and 21908600507.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 860656 + ... + 885745.

It is an arithmetic number, because the mean of its divisors is an integer number (1778710437).

Almost surely, 2^21908600545 is an apocalyptic number.

It is an amenable number.

21908600545 is a deficient number, since it is larger than the sum of its proper divisors (6550766447).

21908600545 is a wasteful number, since it uses less digits than its factorization.

21908600545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1746612.

The product of its (nonzero) digits is 86400, while the sum is 40.

The spelling of 21908600545 in words is "twenty-one billion, nine hundred eight million, six hundred thousand, five hundred forty-five".