212025019985861 has 2 divisors, whose sum is σ = 212025019985862. Its totient is φ = 212025019985860.

The previous prime is 212025019985813. The next prime is 212025019985869. The reversal of 212025019985861 is 168589910520212.

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., 183010842422500 + 29014177563361 = 13528150^2 + 5386481^2 .

It is a cyclic number.

It is not a de Polignac number, because 212025019985861 - 2¹⁸ = 212025019723717 is a prime.

It is a super-2 number, since 2×212025019985861² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 212025019985861.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212025019985869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106012509992930 + 106012509992931.

It is an arithmetic number, because the mean of its divisors is an integer number (106012509992931).

Almost surely, 2^{212025019985861} is an apocalyptic number.

It is an amenable number.

212025019985861 is a deficient number, since it is larger than the sum of its proper divisors (1).

212025019985861 is an equidigital number, since it uses as much as digits as its factorization.

212025019985861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6220800, while the sum is 59.

The spelling of 212025019985861 in words is "two hundred twelve trillion, twenty-five billion, nineteen million, nine hundred eighty-five thousand, eight hundred sixty-one".