21243044341331 has 4 divisors (see below), whose sum is σ = 21325702101672. Its totient is φ = 21160386580992.

The previous prime is 21243044341303. The next prime is 21243044341333. The reversal of 21243044341331 is 13314344034212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21243044341331 - 2¹⁰ = 21243044340307 is a prime.

It is a super-3 number, since 3×21243044341331³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21243044341291 and 21243044341300.

It is not an unprimeable number, because it can be changed into a prime (21243044341333) 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, 41328879785 + ... + 41328880298.

It is an arithmetic number, because the mean of its divisors is an integer number (5331425525418).

Almost surely, 2^{21243044341331} is an apocalyptic number.

21243044341331 is a deficient number, since it is larger than the sum of its proper divisors (82657760341).

21243044341331 is an equidigital number, since it uses as much as digits as its factorization.

21243044341331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82657760340.

The product of its (nonzero) digits is 82944, while the sum is 35.

Adding to 21243044341331 its reverse (13314344034212), we get a palindrome (34557388375543).

The spelling of 21243044341331 in words is "twenty-one trillion, two hundred forty-three billion, forty-four million, three hundred forty-one thousand, three hundred thirty-one".