212000222021221 has 2 divisors, whose sum is σ = 212000222021222. Its totient is φ = 212000222021220.

The previous prime is 212000222021219. The next prime is 212000222021257. The reversal of 212000222021221 is 122120222000212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 122710762545121 + 89289459476100 = 11077489^2 + 9449310^2 .

It is a cyclic number.

It is not a de Polignac number, because 212000222021221 - 2¹ = 212000222021219 is a prime.

Together with 212000222021219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212000222021521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106000111010610 + 106000111010611.

It is an arithmetic number, because the mean of its divisors is an integer number (106000111010611).

Almost surely, 2^{212000222021221} is an apocalyptic number.

It is an amenable number.

212000222021221 is a deficient number, since it is larger than the sum of its proper divisors (1).

212000222021221 is an equidigital number, since it uses as much as digits as its factorization.

212000222021221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 212000222021221 its reverse (122120222000212), we get a palindrome (334120444021433).

The spelling of 212000222021221 in words is "two hundred twelve trillion, two hundred twenty-two million, twenty-one thousand, two hundred twenty-one".