21066364127 has 2 divisors, whose sum is σ = 21066364128. Its totient is φ = 21066364126.

The previous prime is 21066364093. The next prime is 21066364183. The reversal of 21066364127 is 72146366012.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21066364127 - 2¹⁸ = 21066101983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21066360127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10533182063 + 10533182064.

It is an arithmetic number, because the mean of its divisors is an integer number (10533182064).

Almost surely, 2^21066364127 is an apocalyptic number.

21066364127 is a deficient number, since it is larger than the sum of its proper divisors (1).

21066364127 is an equidigital number, since it uses as much as digits as its factorization.

21066364127 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 38.

The spelling of 21066364127 in words is "twenty-one billion, sixty-six million, three hundred sixty-four thousand, one hundred twenty-seven".