21340410324243 has 32 divisors (see below), whose sum is σ = 30152894016000. Its totient is φ = 13396931387136.

The previous prime is 21340410324241. The next prime is 21340410324257. The reversal of 21340410324243 is 34242301404312.

It is not a de Polignac number, because 21340410324243 - 2¹ = 21340410324241 is a prime.

It is a super-2 number, since 2×21340410324243² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21340410324241) 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, 6003933 + ... + 8872881.

It is an arithmetic number, because the mean of its divisors is an integer number (942277938000).

Almost surely, 2^{21340410324243} is an apocalyptic number.

21340410324243 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21340410324243 is a deficient number, since it is larger than the sum of its proper divisors (8812483691757).

21340410324243 is a wasteful number, since it uses less digits than its factorization.

21340410324243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2870651.

The product of its (nonzero) digits is 55296, while the sum is 33.

Adding to 21340410324243 its reverse (34242301404312), we get a palindrome (55582711728555).

It can be divided in two parts, 21340410 and 324243, that added together give a triangular number (21664653 = T₆₅₈₂).

The spelling of 21340410324243 in words is "twenty-one trillion, three hundred forty billion, four hundred ten million, three hundred twenty-four thousand, two hundred forty-three".