21404414443 has 2 divisors, whose sum is σ = 21404414444. Its totient is φ = 21404414442.

The previous prime is 21404414407. The next prime is 21404414459. The reversal of 21404414443 is 34441440412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21404414443 - 2³³ = 12814479851 is a prime.

It is not a weakly prime, because it can be changed into another prime (21404418443) 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 as a sum of consecutive naturals, namely, 10702207221 + 10702207222.

It is an arithmetic number, because the mean of its divisors is an integer number (10702207222).

Almost surely, 2^21404414443 is an apocalyptic number.

21404414443 is a deficient number, since it is larger than the sum of its proper divisors (1).

21404414443 is an equidigital number, since it uses as much as digits as its factorization.

21404414443 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24576, while the sum is 31.

Adding to 21404414443 its reverse (34441440412), we get a palindrome (55845854855).

The spelling of 21404414443 in words is "twenty-one billion, four hundred four million, four hundred fourteen thousand, four hundred forty-three".