21775600109 has 2 divisors, whose sum is σ = 21775600110. Its totient is φ = 21775600108.

The previous prime is 21775600073. The next prime is 21775600117. The reversal of 21775600109 is 90100657712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12536161225 + 9239438884 = 111965^2 + 96122^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21775600109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21775600139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10887800054 + 10887800055.

It is an arithmetic number, because the mean of its divisors is an integer number (10887800055).

Almost surely, 2^21775600109 is an apocalyptic number.

It is an amenable number.

21775600109 is a deficient number, since it is larger than the sum of its proper divisors (1).

21775600109 is an equidigital number, since it uses as much as digits as its factorization.

21775600109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26460, while the sum is 38.

The spelling of 21775600109 in words is "twenty-one billion, seven hundred seventy-five million, six hundred thousand, one hundred nine".