21244311443 has 4 divisors (see below), whose sum is σ = 22493976840. Its totient is φ = 19994646048.

The previous prime is 21244311433. The next prime is 21244311463. The reversal of 21244311443 is 34411344212.

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 21244311443 - 2¹⁶ = 21244245907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21244311433) 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, 624832673 + ... + 624832706.

It is an arithmetic number, because the mean of its divisors is an integer number (5623494210).

Almost surely, 2^21244311443 is an apocalyptic number.

21244311443 is a deficient number, since it is larger than the sum of its proper divisors (1249665397).

21244311443 is a wasteful number, since it uses less digits than its factorization.

21244311443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1249665396.

The product of its digits is 9216, while the sum is 29.

Adding to 21244311443 its reverse (34411344212), we get a palindrome (55655655655).

The spelling of 21244311443 in words is "twenty-one billion, two hundred forty-four million, three hundred eleven thousand, four hundred forty-three".