21817289596144 has 80 divisors (see below), whose sum is σ = 51048238417920. Its totient is φ = 8830521722880.

The previous prime is 21817289596139. The next prime is 21817289596147. The reversal of 21817289596144 is 44169598271812.

It is a self number, because there is not a number n which added to its sum of digits gives 21817289596144.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21817289596147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53400577 + ... + 53807584.

It is an arithmetic number, because the mean of its divisors is an integer number (638102980224).

Almost surely, 2^{21817289596144} is an apocalyptic number.

It is an amenable number.

21817289596144 is an abundant number, since it is smaller than the sum of its proper divisors (29230948821776).

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

21817289596144 is a wasteful number, since it uses less digits than its factorization.

21817289596144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107208278 (or 107208272 counting only the distinct ones).

The product of its digits is 69672960, while the sum is 67.

The spelling of 21817289596144 in words is "twenty-one trillion, eight hundred seventeen billion, two hundred eighty-nine million, five hundred ninety-six thousand, one hundred forty-four".