21443511342243 has 4 divisors (see below), whose sum is σ = 28591348456328. Its totient is φ = 14295674228160.

The previous prime is 21443511342167. The next prime is 21443511342251. The reversal of 21443511342243 is 34224311534412.

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

It is not a de Polignac number, because 21443511342243 - 2²⁴ = 21443494565027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21443511344243) 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, 3573918557038 + ... + 3573918557043.

It is an arithmetic number, because the mean of its divisors is an integer number (7147837114082).

Almost surely, 2^{21443511342243} is an apocalyptic number.

21443511342243 is a deficient number, since it is larger than the sum of its proper divisors (7147837114085).

21443511342243 is an equidigital number, since it uses as much as digits as its factorization.

21443511342243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7147837114084.

The product of its digits is 276480, while the sum is 39.

Adding to 21443511342243 its reverse (34224311534412), we get a palindrome (55667822876655).

The spelling of 21443511342243 in words is "twenty-one trillion, four hundred forty-three billion, five hundred eleven million, three hundred forty-two thousand, two hundred forty-three".