212101021061 has 2 divisors, whose sum is σ = 212101021062. Its totient is φ = 212101021060.

The previous prime is 212101021039. The next prime is 212101021133. The reversal of 212101021061 is 160120101212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 164161918561 + 47939102500 = 405169^2 + 218950^2 .

It is a cyclic number.

It is not a de Polignac number, because 212101021061 - 2⁶ = 212101020997 is a prime.

It is a Sophie Germain 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 (212101021001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106050510530 + 106050510531.

It is an arithmetic number, because the mean of its divisors is an integer number (106050510531).

Almost surely, 2^212101021061 is an apocalyptic number.

It is an amenable number.

212101021061 is a deficient number, since it is larger than the sum of its proper divisors (1).

212101021061 is an equidigital number, since it uses as much as digits as its factorization.

212101021061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 212101021061 its reverse (160120101212), we get a palindrome (372221122273).

The spelling of 212101021061 in words is "two hundred twelve billion, one hundred one million, twenty-one thousand, sixty-one".