21096129727 has 2 divisors, whose sum is σ = 21096129728. Its totient is φ = 21096129726.

The previous prime is 21096129707. The next prime is 21096129751. The reversal of 21096129727 is 72792169012.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21096129727 - 2⁷ = 21096129599 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21096129707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10548064863 + 10548064864.

It is an arithmetic number, because the mean of its divisors is an integer number (10548064864).

Almost surely, 2^21096129727 is an apocalyptic number.

21096129727 is a deficient number, since it is larger than the sum of its proper divisors (1).

21096129727 is an equidigital number, since it uses as much as digits as its factorization.

21096129727 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 190512, while the sum is 46.

The spelling of 21096129727 in words is "twenty-one billion, ninety-six million, one hundred twenty-nine thousand, seven hundred twenty-seven".