20881127009 has 2 divisors, whose sum is σ = 20881127010. Its totient is φ = 20881127008.

The previous prime is 20881126997. The next prime is 20881127011. The reversal of 20881127009 is 90072118802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20881117009 + 10000 = 144503^2 + 100^2 .

It is a cyclic number.

It is not a de Polignac number, because 20881127009 - 2³² = 16586159713 is a prime.

Together with 20881127011, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20881127209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10440563504 + 10440563505.

It is an arithmetic number, because the mean of its divisors is an integer number (10440563505).

Almost surely, 2^20881127009 is an apocalyptic number.

It is an amenable number.

20881127009 is a deficient number, since it is larger than the sum of its proper divisors (1).

20881127009 is an equidigital number, since it uses as much as digits as its factorization.

20881127009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16128, while the sum is 38.

The spelling of 20881127009 in words is "twenty billion, eight hundred eighty-one million, one hundred twenty-seven thousand, nine".