21003311347 has 2 divisors, whose sum is σ = 21003311348. Its totient is φ = 21003311346.

The previous prime is 21003311333. The next prime is 21003311359. The reversal of 21003311347 is 74311330012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21003311347 - 2³¹ = 18855827699 is a prime.

It is a super-2 number, since 2×21003311347² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21003311387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10501655673 + 10501655674.

It is an arithmetic number, because the mean of its divisors is an integer number (10501655674).

Almost surely, 2^21003311347 is an apocalyptic number.

21003311347 is a deficient number, since it is larger than the sum of its proper divisors (1).

21003311347 is an equidigital number, since it uses as much as digits as its factorization.

21003311347 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1512, while the sum is 25.

Adding to 21003311347 its reverse (74311330012), we get a palindrome (95314641359).

The spelling of 21003311347 in words is "twenty-one billion, three million, three hundred eleven thousand, three hundred forty-seven".