21340323243 has 48 divisors (see below), whose sum is σ = 32674876416. Its totient is φ = 13393343040.

The previous prime is 21340323181. The next prime is 21340323247. The reversal of 21340323243 is 34232304312.

21340323243 is a `hidden beast` number, since 2 + 13 + 403 + 2 + 3 + 243 = 666.

It is not a de Polignac number, because 21340323243 - 2¹⁴ = 21340306859 is a prime.

It is a super-2 number, since 2×21340323243² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21340323247) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 13035421 + ... + 13037057.

It is an arithmetic number, because the mean of its divisors is an integer number (680726592).

Almost surely, 2^21340323243 is an apocalyptic number.

21340323243 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21340323243 is a deficient number, since it is larger than the sum of its proper divisors (11334553173).

21340323243 is a wasteful number, since it uses less digits than its factorization.

21340323243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2624 (or 2621 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 27.

Adding to 21340323243 its reverse (34232304312), we get a palindrome (55572627555).

The spelling of 21340323243 in words is "twenty-one billion, three hundred forty million, three hundred twenty-three thousand, two hundred forty-three".