212100022061 has 2 divisors, whose sum is σ = 212100022062. Its totient is φ = 212100022060.

The previous prime is 212100022051. The next prime is 212100022117. The reversal of 212100022061 is 160220001212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 198910648036 + 13189374025 = 445994^2 + 114845^2 .

It is a cyclic number.

It is not a de Polignac number, because 212100022061 - 2⁶ = 212100021997 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 (212100022051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106050011030 + 106050011031.

It is an arithmetic number, because the mean of its divisors is an integer number (106050011031).

Almost surely, 2^212100022061 is an apocalyptic number.

It is an amenable number.

212100022061 is a deficient number, since it is larger than the sum of its proper divisors (1).

212100022061 is an equidigital number, since it uses as much as digits as its factorization.

212100022061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 212100022061 its reverse (160220001212), we get a palindrome (372320023273).

The spelling of 212100022061 in words is "two hundred twelve billion, one hundred million, twenty-two thousand, sixty-one".