21003312007 has 2 divisors, whose sum is σ = 21003312008. Its totient is φ = 21003312006.

The previous prime is 21003311981. The next prime is 21003312047. The reversal of 21003312007 is 70021330012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21003312007 - 2¹¹ = 21003309959 is a prime.

It is a super-2 number, since 2×21003312007² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21003312047) 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, 10501656003 + 10501656004.

It is an arithmetic number, because the mean of its divisors is an integer number (10501656004).

Almost surely, 2^21003312007 is an apocalyptic number.

21003312007 is a deficient number, since it is larger than the sum of its proper divisors (1).

21003312007 is an equidigital number, since it uses as much as digits as its factorization.

21003312007 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 252, while the sum is 19.

Adding to 21003312007 its reverse (70021330012), we get a palindrome (91024642019).

The spelling of 21003312007 in words is "twenty-one billion, three million, three hundred twelve thousand, seven".