212020122121021 has 2 divisors, whose sum is σ = 212020122121022. Its totient is φ = 212020122121020.

The previous prime is 212020122121013. The next prime is 212020122121061. The reversal of 212020122121021 is 120121221020212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 187854737532121 + 24165384588900 = 13706011^2 + 4915830^2 .

It is a cyclic number.

It is not a de Polignac number, because 212020122121021 - 2³ = 212020122121013 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 212020122121021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212020122121061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106010061060510 + 106010061060511.

It is an arithmetic number, because the mean of its divisors is an integer number (106010061060511).

Almost surely, 2^{212020122121021} is an apocalyptic number.

It is an amenable number.

212020122121021 is a deficient number, since it is larger than the sum of its proper divisors (1).

212020122121021 is an equidigital number, since it uses as much as digits as its factorization.

212020122121021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 212020122121021 its reverse (120121221020212), we get a palindrome (332141343141233).

The spelling of 212020122121021 in words is "two hundred twelve trillion, twenty billion, one hundred twenty-two million, one hundred twenty-one thousand, twenty-one".