21111086447569 has 2 divisors, whose sum is σ = 21111086447570. Its totient is φ = 21111086447568.

The previous prime is 21111086447533. The next prime is 21111086447573. The reversal of 21111086447569 is 96574468011112.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17060105030544 + 4050981417025 = 4130388^2 + 2012705^2 .

It is a cyclic number.

It is not a de Polignac number, because 21111086447569 - 2⁷ = 21111086447441 is a prime.

It is a super-2 number, since 2×21111086447569² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21111086447579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10555543223784 + 10555543223785.

It is an arithmetic number, because the mean of its divisors is an integer number (10555543223785).

Almost surely, 2^{21111086447569} is an apocalyptic number.

It is an amenable number.

21111086447569 is a deficient number, since it is larger than the sum of its proper divisors (1).

21111086447569 is an equidigital number, since it uses as much as digits as its factorization.

21111086447569 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2903040, while the sum is 55.

The spelling of 21111086447569 in words is "twenty-one trillion, one hundred eleven billion, eighty-six million, four hundred forty-seven thousand, five hundred sixty-nine".