21300020387 has 2 divisors, whose sum is σ = 21300020388. Its totient is φ = 21300020386.

The previous prime is 21300020351. The next prime is 21300020437. The reversal of 21300020387 is 78302000312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21300020387 - 2⁶ = 21300020323 is a prime.

It is not a weakly prime, because it can be changed into another prime (21300020087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10650010193 + 10650010194.

It is an arithmetic number, because the mean of its divisors is an integer number (10650010194).

Almost surely, 2^21300020387 is an apocalyptic number.

21300020387 is a deficient number, since it is larger than the sum of its proper divisors (1).

21300020387 is an equidigital number, since it uses as much as digits as its factorization.

21300020387 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 26.

Adding to 21300020387 its reverse (78302000312), we get a palindrome (99602020699).

The spelling of 21300020387 in words is "twenty-one billion, three hundred million, twenty thousand, three hundred eighty-seven".