21432042223441 has 4 divisors (see below), whose sum is σ = 21432053260800. Its totient is φ = 21432031186084.

The previous prime is 21432042223439. The next prime is 21432042223477. The reversal of 21432042223441 is 14432224023412.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 21432042223441 - 2¹ = 21432042223439 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21432042223397 and 21432042223406.

It is not an unprimeable number, because it can be changed into a prime (21432042923441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1746601 + ... + 6776038.

It is an arithmetic number, because the mean of its divisors is an integer number (5358013315200).

Almost surely, 2^{21432042223441} is an apocalyptic number.

It is an amenable number.

21432042223441 is a deficient number, since it is larger than the sum of its proper divisors (11037359).

21432042223441 is an equidigital number, since it uses as much as digits as its factorization.

21432042223441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11037358.

The product of its (nonzero) digits is 73728, while the sum is 34.

Adding to 21432042223441 its reverse (14432224023412), we get a palindrome (35864266246853).

The spelling of 21432042223441 in words is "twenty-one trillion, four hundred thirty-two billion, forty-two million, two hundred twenty-three thousand, four hundred forty-one".