21442432043 has 2 divisors, whose sum is σ = 21442432044. Its totient is φ = 21442432042.

The previous prime is 21442432021. The next prime is 21442432091. The reversal of 21442432043 is 34023424412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21442432043 - 2¹⁸ = 21442169899 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21442431997 and 21442432015.

It is not a weakly prime, because it can be changed into another prime (21442482043) 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 as a sum of consecutive naturals, namely, 10721216021 + 10721216022.

It is an arithmetic number, because the mean of its divisors is an integer number (10721216022).

Almost surely, 2^21442432043 is an apocalyptic number.

21442432043 is a deficient number, since it is larger than the sum of its proper divisors (1).

21442432043 is an equidigital number, since it uses as much as digits as its factorization.

21442432043 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18432, while the sum is 29.

Adding to 21442432043 its reverse (34023424412), we get a palindrome (55465856455).

The spelling of 21442432043 in words is "twenty-one billion, four hundred forty-two million, four hundred thirty-two thousand, forty-three".