21331243603 has 2 divisors, whose sum is σ = 21331243604. Its totient is φ = 21331243602.

The previous prime is 21331243573. The next prime is 21331243607. The reversal of 21331243603 is 30634213312.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21331243603 is a prime.

It is not a weakly prime, because it can be changed into another prime (21331243607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10665621801 + 10665621802.

It is an arithmetic number, because the mean of its divisors is an integer number (10665621802).

Almost surely, 2^21331243603 is an apocalyptic number.

21331243603 is a deficient number, since it is larger than the sum of its proper divisors (1).

21331243603 is an equidigital number, since it uses as much as digits as its factorization.

21331243603 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 28.

Adding to 21331243603 its reverse (30634213312), we get a palindrome (51965456915).

The spelling of 21331243603 in words is "twenty-one billion, three hundred thirty-one million, two hundred forty-three thousand, six hundred three".