21021000307 has 2 divisors, whose sum is σ = 21021000308. Its totient is φ = 21021000306.

The previous prime is 21021000289. The next prime is 21021000313. The reversal of 21021000307 is 70300012012.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21021000307 is a prime.

It is not a weakly prime, because it can be changed into another prime (21021000337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10510500153 + 10510500154.

It is an arithmetic number, because the mean of its divisors is an integer number (10510500154).

Almost surely, 2^21021000307 is an apocalyptic number.

21021000307 is a deficient number, since it is larger than the sum of its proper divisors (1).

21021000307 is an equidigital number, since it uses as much as digits as its factorization.

21021000307 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 84, while the sum is 16.

Adding to 21021000307 its reverse (70300012012), we get a palindrome (91321012319).

The spelling of 21021000307 in words is "twenty-one billion, twenty-one million, three hundred seven", and thus it is an aban number.