212020111601 has 2 divisors, whose sum is σ = 212020111602. Its totient is φ = 212020111600.

The previous prime is 212020111591. The next prime is 212020111637. The reversal of 212020111601 is 106111020212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 211158630400 + 861481201 = 459520^2 + 29351^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212020111601 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 212020111601.

It is not a weakly prime, because it can be changed into another prime (212020111661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106010055800 + 106010055801.

It is an arithmetic number, because the mean of its divisors is an integer number (106010055801).

Almost surely, 2^212020111601 is an apocalyptic number.

It is an amenable number.

212020111601 is a deficient number, since it is larger than the sum of its proper divisors (1).

212020111601 is an equidigital number, since it uses as much as digits as its factorization.

212020111601 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 212020111601 its reverse (106111020212), we get a palindrome (318131131813).

The spelling of 212020111601 in words is "two hundred twelve billion, twenty million, one hundred eleven thousand, six hundred one".