212210121012221 has 2 divisors, whose sum is σ = 212210121012222. Its totient is φ = 212210121012220.

The previous prime is 212210121012181. The next prime is 212210121012233. The reversal of 212210121012221 is 122210121012212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 212160752616121 + 49368396100 = 14565739^2 + 222190^2 .

It is a cyclic number.

It is not a de Polignac number, because 212210121012221 - 2⁶ = 212210121012157 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212210121012193 and 212210121012202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212210121012271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106105060506110 + 106105060506111.

It is an arithmetic number, because the mean of its divisors is an integer number (106105060506111).

Almost surely, 2^{212210121012221} is an apocalyptic number.

It is an amenable number.

212210121012221 is a deficient number, since it is larger than the sum of its proper divisors (1).

212210121012221 is an equidigital number, since it uses as much as digits as its factorization.

212210121012221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 212210121012221 its reverse (122210121012212), we get a palindrome (334420242024433).

Subtracting from 212210121012221 its reverse (122210121012212), we obtain a palindrome (90000000000009).

The spelling of 212210121012221 in words is "two hundred twelve trillion, two hundred ten billion, one hundred twenty-one million, twelve thousand, two hundred twenty-one".