21486025776109 has 2 divisors, whose sum is σ = 21486025776110. Its totient is φ = 21486025776108.

The previous prime is 21486025776041. The next prime is 21486025776143. The reversal of 21486025776109 is 90167752068412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11763185062500 + 9722840713609 = 3429750^2 + 3118147^2 .

It is a cyclic number.

It is not a de Polignac number, because 21486025776109 - 2⁹ = 21486025775597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21486025776409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10743012888054 + 10743012888055.

It is an arithmetic number, because the mean of its divisors is an integer number (10743012888055).

Almost surely, 2^{21486025776109} is an apocalyptic number.

It is an amenable number.

21486025776109 is a deficient number, since it is larger than the sum of its proper divisors (1).

21486025776109 is an equidigital number, since it uses as much as digits as its factorization.

21486025776109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10160640, while the sum is 58.

The spelling of 21486025776109 in words is "twenty-one trillion, four hundred eighty-six billion, twenty-five million, seven hundred seventy-six thousand, one hundred nine".