21041013244243 has 16 divisors (see below), whose sum is σ = 22743598218880. Its totient is φ = 19401220730304.

The previous prime is 21041013244231. The next prime is 21041013244267. The reversal of 21041013244243 is 34244231014012.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21041013244243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21041013844243) by changing a digit.

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, 45270546 + ... + 45732967.

It is an arithmetic number, because the mean of its divisors is an integer number (1421474888680).

Almost surely, 2^{21041013244243} is an apocalyptic number.

21041013244243 is a deficient number, since it is larger than the sum of its proper divisors (1702584974637).

21041013244243 is a wasteful number, since it uses less digits than its factorization.

21041013244243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91003858.

The product of its (nonzero) digits is 18432, while the sum is 31.

Adding to 21041013244243 its reverse (34244231014012), we get a palindrome (55285244258255).

The spelling of 21041013244243 in words is "twenty-one trillion, forty-one billion, thirteen million, two hundred forty-four thousand, two hundred forty-three".