21141223443 has 24 divisors (see below), whose sum is σ = 32351799168. Its totient is φ = 13257629952.

The previous prime is 21141223393. The next prime is 21141223457. The reversal of 21141223443 is 34432214112.

21141223443 is a `hidden beast` number, since 2 + 11 + 412 + 234 + 4 + 3 = 666.

It is not a de Polignac number, because 21141223443 - 2⁶ = 21141223379 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21141223043) 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 23 ways as a sum of consecutive naturals, for example, 241021 + ... + 316817.

It is an arithmetic number, because the mean of its divisors is an integer number (1347991632).

Almost surely, 2^21141223443 is an apocalyptic number.

21141223443 is a deficient number, since it is larger than the sum of its proper divisors (11210575725).

21141223443 is a wasteful number, since it uses less digits than its factorization.

21141223443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77643 (or 77640 counting only the distinct ones).

The product of its digits is 4608, while the sum is 27.

Adding to 21141223443 its reverse (34432214112), we get a palindrome (55573437555).

The spelling of 21141223443 in words is "twenty-one billion, one hundred forty-one million, two hundred twenty-three thousand, four hundred forty-three".