21936816127 has 2 divisors, whose sum is σ = 21936816128. Its totient is φ = 21936816126.

The previous prime is 21936816113. The next prime is 21936816199. The reversal of 21936816127 is 72161863912.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21936816127 - 2²³ = 21928427519 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21936816107) 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, 10968408063 + 10968408064.

It is an arithmetic number, because the mean of its divisors is an integer number (10968408064).

Almost surely, 2^21936816127 is an apocalyptic number.

21936816127 is a deficient number, since it is larger than the sum of its proper divisors (1).

21936816127 is an equidigital number, since it uses as much as digits as its factorization.

21936816127 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 217728, while the sum is 46.

The spelling of 21936816127 in words is "twenty-one billion, nine hundred thirty-six million, eight hundred sixteen thousand, one hundred twenty-seven".