21223424443 has 32 divisors (see below), whose sum is σ = 23479061760. Its totient is φ = 19065594240.

The previous prime is 21223424437. The next prime is 21223424471. The reversal of 21223424443 is 34442432212.

It is a cyclic number.

It is not a de Polignac number, because 21223424443 - 2¹³ = 21223416251 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21223424543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 30713728 + ... + 30714418.

It is an arithmetic number, because the mean of its divisors is an integer number (733720680).

Almost surely, 2^21223424443 is an apocalyptic number.

21223424443 is a deficient number, since it is larger than the sum of its proper divisors (2255637317).

21223424443 is a wasteful number, since it uses less digits than its factorization.

21223424443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1147.

The product of its digits is 36864, while the sum is 31.

Adding to 21223424443 its reverse (34442432212), we get a palindrome (55665856655).

The spelling of 21223424443 in words is "twenty-one billion, two hundred twenty-three million, four hundred twenty-four thousand, four hundred forty-three".