21234016127 has 2 divisors, whose sum is σ = 21234016128. Its totient is φ = 21234016126.

The previous prime is 21234016121. The next prime is 21234016157. The reversal of 21234016127 is 72161043212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21234016127 - 2⁸ = 21234015871 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21234016127.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21234016121) 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, 10617008063 + 10617008064.

It is an arithmetic number, because the mean of its divisors is an integer number (10617008064).

Almost surely, 2^21234016127 is an apocalyptic number.

21234016127 is a deficient number, since it is larger than the sum of its proper divisors (1).

21234016127 is an equidigital number, since it uses as much as digits as its factorization.

21234016127 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 29.

Adding to 21234016127 its reverse (72161043212), we get a palindrome (93395059339).

The spelling of 21234016127 in words is "twenty-one billion, two hundred thirty-four million, sixteen thousand, one hundred twenty-seven".