212020301221 has 2 divisors, whose sum is σ = 212020301222.
Its totient is φ = 212020301220.
The previous prime is 212020301131. The next prime is 212020301239. The reversal of 212020301221 is 122103020212.
It is a happy number.
212020301221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 168469202500 + 43551098721 = 410450^2 + 208689^2
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-212020301221 is a prime.
It is a junction number, because it is equal to n+sod(n) for n = 212020301195 and 212020301204.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (212420301221) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (19) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106010150610 + 106010150611.
It is an arithmetic number, because the mean of its divisors is an integer number (106010150611).
Almost surely, 2212020301221 is an apocalyptic number.
It is an amenable number.
212020301221 is a deficient number, since it is larger than the sum of its proper divisors (1).
212020301221 is an equidigital number, since it uses as much as digits as its factorization.
212020301221 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 96, while the sum is 16.
Adding to 212020301221 its reverse (122103020212), we get a palindrome (334123321433).
The spelling of 212020301221 in words is "two hundred twelve billion, twenty million, three hundred one thousand, two hundred twenty-one".