12220210221221 has 2 divisors, whose sum is σ = 12220210221222. Its totient is φ = 12220210221220.

The previous prime is 12220210221203. The next prime is 12220210221257. The reversal of 12220210221221 is 12212201202221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7854258477025 + 4365951744196 = 2802545^2 + 2089486^2 .

It is an emirp because it is prime and its reverse (12212201202221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12220210221221 - 2⁶ = 12220210221157 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12220210221193 and 12220210221202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12220270221221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6110105110610 + 6110105110611.

It is an arithmetic number, because the mean of its divisors is an integer number (6110105110611).

Almost surely, 2^{12220210221221} is an apocalyptic number.

It is an amenable number.

12220210221221 is a deficient number, since it is larger than the sum of its proper divisors (1).

12220210221221 is an equidigital number, since it uses as much as digits as its factorization.

12220210221221 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 20.

Adding to 12220210221221 its reverse (12212201202221), we get a palindrome (24432411423442).

The spelling of 12220210221221 in words is "twelve trillion, two hundred twenty billion, two hundred ten million, two hundred twenty-one thousand, two hundred twenty-one".