21589312305 has 64 divisors (see below), whose sum is σ = 41034470400. Its totient is φ = 9574629120.

The previous prime is 21589312279. The next prime is 21589312309. The reversal of 21589312305 is 50321398512.

It is not a de Polignac number, because 21589312305 - 2¹⁰ = 21589311281 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21589312309) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 27819 + ... + 209648.

It is an arithmetic number, because the mean of its divisors is an integer number (641163600).

Almost surely, 2^21589312305 is an apocalyptic number.

It is an amenable number.

21589312305 is a deficient number, since it is larger than the sum of its proper divisors (19445158095).

21589312305 is a wasteful number, since it uses less digits than its factorization.

21589312305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237534.

The product of its (nonzero) digits is 64800, while the sum is 39.

The spelling of 21589312305 in words is "twenty-one billion, five hundred eighty-nine million, three hundred twelve thousand, three hundred five".