21300240307 has 2 divisors, whose sum is σ = 21300240308. Its totient is φ = 21300240306.

The previous prime is 21300240293. The next prime is 21300240319. The reversal of 21300240307 is 70304200312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21300240307 - 2²³ = 21291851699 is a prime.

It is not a weakly prime, because it can be changed into another prime (21300240107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10650120153 + 10650120154.

It is an arithmetic number, because the mean of its divisors is an integer number (10650120154).

Almost surely, 2^21300240307 is an apocalyptic number.

21300240307 is a deficient number, since it is larger than the sum of its proper divisors (1).

21300240307 is an equidigital number, since it uses as much as digits as its factorization.

21300240307 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 22.

Adding to 21300240307 its reverse (70304200312), we get a palindrome (91604440619).

The spelling of 21300240307 in words is "twenty-one billion, three hundred million, two hundred forty thousand, three hundred seven".