21342112443 has 64 divisors (see below), whose sum is σ = 34182051840. Its totient is φ = 13112064000.

The previous prime is 21342112433. The next prime is 21342112447. The reversal of 21342112443 is 34421124312.

21342112443 is a `hidden beast` number, since 2 + 1 + 3 + 4 + 211 + 2 + 443 = 666.

It is not a de Polignac number, because 21342112443 - 2¹⁶ = 21342046907 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (21342112447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4918771 + ... + 4923107.

It is an arithmetic number, because the mean of its divisors is an integer number (534094560).

Almost surely, 2^21342112443 is an apocalyptic number.

21342112443 is a deficient number, since it is larger than the sum of its proper divisors (12839939397).

21342112443 is a wasteful number, since it uses less digits than its factorization.

21342112443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4585 (or 4579 counting only the distinct ones).

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

Adding to 21342112443 its reverse (34421124312), we get a palindrome (55763236755).

The spelling of 21342112443 in words is "twenty-one billion, three hundred forty-two million, one hundred twelve thousand, four hundred forty-three".