212120313220021 has 2 divisors, whose sum is σ = 212120313220022. Its totient is φ = 212120313220020.

The previous prime is 212120313219883. The next prime is 212120313220111. The reversal of 212120313220021 is 120022313021212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 162193214960100 + 49927098259921 = 12735510^2 + 7065911^2 .

It is a cyclic number.

It is not a de Polignac number, because 212120313220021 - 2³⁷ = 211982874266549 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212120313219974 and 212120313220001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212120313220721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106060156610010 + 106060156610011.

It is an arithmetic number, because the mean of its divisors is an integer number (106060156610011).

Almost surely, 2^{212120313220021} is an apocalyptic number.

It is an amenable number.

212120313220021 is a deficient number, since it is larger than the sum of its proper divisors (1).

212120313220021 is an equidigital number, since it uses as much as digits as its factorization.

212120313220021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 212120313220021 its reverse (120022313021212), we get a palindrome (332142626241233).

The spelling of 212120313220021 in words is "two hundred twelve trillion, one hundred twenty billion, three hundred thirteen million, two hundred twenty thousand, twenty-one".