21202005443 has 2 divisors, whose sum is σ = 21202005444. Its totient is φ = 21202005442.

The previous prime is 21202005427. The next prime is 21202005457. The reversal of 21202005443 is 34450020212.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21202005443 - 2⁴ = 21202005427 is a prime.

It is not a weakly prime, because it can be changed into another prime (21202005943) 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, 10601002721 + 10601002722.

It is an arithmetic number, because the mean of its divisors is an integer number (10601002722).

Almost surely, 2^21202005443 is an apocalyptic number.

21202005443 is a deficient number, since it is larger than the sum of its proper divisors (1).

21202005443 is an equidigital number, since it uses as much as digits as its factorization.

21202005443 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1920, while the sum is 23.

Adding to 21202005443 its reverse (34450020212), we get a palindrome (55652025655).

The spelling of 21202005443 in words is "twenty-one billion, two hundred two million, five thousand, four hundred forty-three".