21030021127 has 2 divisors, whose sum is σ = 21030021128. Its totient is φ = 21030021126.

The previous prime is 21030021041. The next prime is 21030021163. The reversal of 21030021127 is 72112003012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21030021127 - 2¹¹ = 21030019079 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21030021827) 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, 10515010563 + 10515010564.

It is an arithmetic number, because the mean of its divisors is an integer number (10515010564).

Almost surely, 2^21030021127 is an apocalyptic number.

21030021127 is a deficient number, since it is larger than the sum of its proper divisors (1).

21030021127 is an equidigital number, since it uses as much as digits as its factorization.

21030021127 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 168, while the sum is 19.

Adding to 21030021127 its reverse (72112003012), we get a palindrome (93142024139).

The spelling of 21030021127 in words is "twenty-one billion, thirty million, twenty-one thousand, one hundred twenty-seven".