21441323243 has 4 divisors (see below), whose sum is σ = 22569813960. Its totient is φ = 20312832528.

The previous prime is 21441323207. The next prime is 21441323269. The reversal of 21441323243 is 34232314412.

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 21441323243 - 2⁶ = 21441323179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21441326243) 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, 564245330 + ... + 564245367.

It is an arithmetic number, because the mean of its divisors is an integer number (5642453490).

Almost surely, 2^21441323243 is an apocalyptic number.

21441323243 is a deficient number, since it is larger than the sum of its proper divisors (1128490717).

21441323243 is a wasteful number, since it uses less digits than its factorization.

21441323243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1128490716.

The product of its digits is 13824, while the sum is 29.

Adding to 21441323243 its reverse (34232314412), we get a palindrome (55673637655).

The spelling of 21441323243 in words is "twenty-one billion, four hundred forty-one million, three hundred twenty-three thousand, two hundred forty-three".