21300012287 has 2 divisors, whose sum is σ = 21300012288. Its totient is φ = 21300012286.

The previous prime is 21300012281. The next prime is 21300012319. The reversal of 21300012287 is 78221000312.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21300012287 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21300012281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10650006143 + 10650006144.

It is an arithmetic number, because the mean of its divisors is an integer number (10650006144).

Almost surely, 2^21300012287 is an apocalyptic number.

21300012287 is a deficient number, since it is larger than the sum of its proper divisors (1).

21300012287 is an equidigital number, since it uses as much as digits as its factorization.

21300012287 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1344, while the sum is 26.

Adding to 21300012287 its reverse (78221000312), we get a palindrome (99521012599).

The spelling of 21300012287 in words is "twenty-one billion, three hundred million, twelve thousand, two hundred eighty-seven".