21738313114243 has 12 divisors (see below), whose sum is σ = 23894298051624. Its totient is φ = 19762004266400.

The previous prime is 21738313114237. The next prime is 21738313114279. The reversal of 21738313114243 is 34241131383712.

It is a happy number.

It is not a de Polignac number, because 21738313114243 - 2¹⁷ = 21738312983171 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21738313114243.

It is not an unprimeable number, because it can be changed into a prime (21738313114223) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 36351048 + ... + 36944218.

It is an arithmetic number, because the mean of its divisors is an integer number (1991191504302).

Almost surely, 2^{21738313114243} is an apocalyptic number.

21738313114243 is a deficient number, since it is larger than the sum of its proper divisors (2155984937381).

21738313114243 is a wasteful number, since it uses less digits than its factorization.

21738313114243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 896066 (or 896055 counting only the distinct ones).

The product of its digits is 290304, while the sum is 43.

Adding to 21738313114243 its reverse (34241131383712), we get a palindrome (55979444497955).

The spelling of 21738313114243 in words is "twenty-one trillion, seven hundred thirty-eight billion, three hundred thirteen million, one hundred fourteen thousand, two hundred forty-three".