210012210011221 has 2 divisors, whose sum is σ = 210012210011222. Its totient is φ = 210012210011220.

The previous prime is 210012210011179. The next prime is 210012210011231. The reversal of 210012210011221 is 122110012210012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 208569775383025 + 1442434628196 = 14441945^2 + 1201014^2 .

It is a cyclic number.

It is not a de Polignac number, because 210012210011221 - 2⁹ = 210012210010709 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 210012210011195 and 210012210011204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210012210011231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105006105005610 + 105006105005611.

It is an arithmetic number, because the mean of its divisors is an integer number (105006105005611).

Almost surely, 2^{210012210011221} is an apocalyptic number.

It is an amenable number.

210012210011221 is a deficient number, since it is larger than the sum of its proper divisors (1).

210012210011221 is an equidigital number, since it uses as much as digits as its factorization.

210012210011221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 210012210011221 its reverse (122110012210012), we get a palindrome (332122222221233).

The spelling of 210012210011221 in words is "two hundred ten trillion, twelve billion, two hundred ten million, eleven thousand, two hundred twenty-one".