21243332322243 has 80 divisors (see below), whose sum is σ = 33267243609600. Its totient is φ = 13492176868800.

The previous prime is 21243332322137. The next prime is 21243332322269. The reversal of 21243332322243 is 34222323334212.

21243332322243 is a `hidden beast` number, since 2 + 12 + 43 + 332 + 32 + 2 + 243 = 666.

It is not a de Polignac number, because 21243332322243 - 2¹⁰ = 21243332321219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21243332322198 and 21243332322207.

It is not an unprimeable number, because it can be changed into a prime (21243332322943) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 53021718 + ... + 53420868.

It is an arithmetic number, because the mean of its divisors is an integer number (415840545120).

Almost surely, 2^{21243332322243} is an apocalyptic number.

21243332322243 is a deficient number, since it is larger than the sum of its proper divisors (12023911287357).

21243332322243 is a wasteful number, since it uses less digits than its factorization.

21243332322243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 399494 (or 399485 counting only the distinct ones).

The product of its digits is 248832, while the sum is 36.

Adding to 21243332322243 its reverse (34222323334212), we get a palindrome (55465655656455).

The spelling of 21243332322243 in words is "twenty-one trillion, two hundred forty-three billion, three hundred thirty-two million, three hundred twenty-two thousand, two hundred forty-three".