21248845528065 has 32 divisors (see below), whose sum is σ = 34189798032000. Its totient is φ = 11268842227200.

The previous prime is 21248845528063. The next prime is 21248845528087. The reversal of 21248845528065 is 56082554884212.

It is not a de Polignac number, because 21248845528065 - 2¹ = 21248845528063 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21248845528063) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 56468661 + ... + 56843709.

It is an arithmetic number, because the mean of its divisors is an integer number (1068431188500).

Almost surely, 2^{21248845528065} is an apocalyptic number.

It is an amenable number.

21248845528065 is a deficient number, since it is larger than the sum of its proper divisors (12940952503935).

21248845528065 is a wasteful number, since it uses less digits than its factorization.

21248845528065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 396337.

The product of its (nonzero) digits is 49152000, while the sum is 60.

The spelling of 21248845528065 in words is "twenty-one trillion, two hundred forty-eight billion, eight hundred forty-five million, five hundred twenty-eight thousand, sixty-five".