21243332322241 has 4 divisors (see below), whose sum is σ = 21243342672772. Its totient is φ = 21243321971712.

The previous prime is 21243332322137. The next prime is 21243332322269. The reversal of 21243332322241 is 14222323334212.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 16141945431616 + 5101386890625 = 4017704^2 + 2258625^2 .

It is a cyclic number.

It is not a de Polignac number, because 21243332322241 - 2¹¹ = 21243332320193 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21243332322197 and 21243332322206.

It is not an unprimeable number, because it can be changed into a prime (21243332326241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 942960 + ... + 6586033.

It is an arithmetic number, because the mean of its divisors is an integer number (5310835668193).

Almost surely, 2^{21243332322241} is an apocalyptic number.

It is an amenable number.

21243332322241 is a deficient number, since it is larger than the sum of its proper divisors (10350531).

21243332322241 is an equidigital number, since it uses as much as digits as its factorization.

21243332322241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10350530.

The product of its digits is 82944, while the sum is 34.

Adding to 21243332322241 its reverse (14222323334212), we get a palindrome (35465655656453).

The spelling of 21243332322241 in words is "twenty-one trillion, two hundred forty-three billion, three hundred thirty-two million, three hundred twenty-two thousand, two hundred forty-one".