21405030307 has 2 divisors, whose sum is σ = 21405030308. Its totient is φ = 21405030306.

The previous prime is 21405030287. The next prime is 21405030331. The reversal of 21405030307 is 70303050412.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21405030307 is a prime.

It is a super-3 number, since 3×21405030307³ (a number of 32 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (21405030347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10702515153 + 10702515154.

It is an arithmetic number, because the mean of its divisors is an integer number (10702515154).

Almost surely, 2^21405030307 is an apocalyptic number.

21405030307 is a deficient number, since it is larger than the sum of its proper divisors (1).

21405030307 is an equidigital number, since it uses as much as digits as its factorization.

21405030307 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2520, while the sum is 25.

Adding to 21405030307 its reverse (70303050412), we get a palindrome (91708080719).

The spelling of 21405030307 in words is "twenty-one billion, four hundred five million, thirty thousand, three hundred seven".