10212305861 has 2 divisors, whose sum is σ = 10212305862. Its totient is φ = 10212305860.

The previous prime is 10212305849. The next prime is 10212305863. The reversal of 10212305861 is 16850321201.

10212305861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5438325025 + 4773980836 = 73745^2 + 69094^2 .

It is a cyclic number.

It is not a de Polignac number, because 10212305861 - 2⁶ = 10212305797 is a prime.

It is a super-2 number, since 2×10212305861² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

Together with 10212305863, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10212305863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5106152930 + 5106152931.

It is an arithmetic number, because the mean of its divisors is an integer number (5106152931).

Almost surely, 2^10212305861 is an apocalyptic number.

It is an amenable number.

10212305861 is a deficient number, since it is larger than the sum of its proper divisors (1).

10212305861 is an equidigital number, since it uses as much as digits as its factorization.

10212305861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 29.

The spelling of 10212305861 in words is "ten billion, two hundred twelve million, three hundred five thousand, eight hundred sixty-one".