21144450897648 has 80 divisors (see below), whose sum is σ = 65361051937440. Its totient is φ = 6505984889856.

The previous prime is 21144450897569. The next prime is 21144450897673. The reversal of 21144450897648 is 84679805444112.

21144450897648 is a `hidden beast` number, since 2 + 1 + 1 + 4 + 445 + 0 + 89 + 76 + 48 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1882513161 + ... + 1882524392.

It is an arithmetic number, because the mean of its divisors is an integer number (817013149218).

Almost surely, 2^{21144450897648} is an apocalyptic number.

It is an amenable number.

21144450897648 is an abundant number, since it is smaller than the sum of its proper divisors (44216601039792).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21144450897648 is a wasteful number, since it uses less digits than its factorization.

21144450897648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3765037583 (or 3765037571 counting only the distinct ones).

The product of its (nonzero) digits is 61931520, while the sum is 63.

The spelling of 21144450897648 in words is "twenty-one trillion, one hundred forty-four billion, four hundred fifty million, eight hundred ninety-seven thousand, six hundred forty-eight".