10511212861 has 2 divisors, whose sum is σ = 10511212862. Its totient is φ = 10511212860.

The previous prime is 10511212849. The next prime is 10511212867. The reversal of 10511212861 is 16821211501.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5996179225 + 4515033636 = 77435^2 + 67194^2 .

It is an emirp because it is prime and its reverse (16821211501) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10511212861 is a prime.

It is a super-2 number, since 2×10511212861² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10511212867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5255606430 + 5255606431.

It is an arithmetic number, because the mean of its divisors is an integer number (5255606431).

Almost surely, 2^10511212861 is an apocalyptic number.

It is an amenable number.

10511212861 is a deficient number, since it is larger than the sum of its proper divisors (1).

10511212861 is an equidigital number, since it uses as much as digits as its factorization.

10511212861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 960, while the sum is 28.

The spelling of 10511212861 in words is "ten billion, five hundred eleven million, two hundred twelve thousand, eight hundred sixty-one".