222121202102221 has 2 divisors, whose sum is σ = 222121202102222. Its totient is φ = 222121202102220.

The previous prime is 222121202102119. The next prime is 222121202102243. The reversal of 222121202102221 is 122201202121222.

It is an a-pointer prime, because the next prime (222121202102243) can be obtained adding 222121202102221 to its sum of digits (22).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 182890083026596 + 39231119075625 = 13523686^2 + 6263475^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-222121202102221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 222121202102192 and 222121202102201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (222121202103221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111060601051110 + 111060601051111.

It is an arithmetic number, because the mean of its divisors is an integer number (111060601051111).

Almost surely, 2^{222121202102221} is an apocalyptic number.

It is an amenable number.

222121202102221 is a deficient number, since it is larger than the sum of its proper divisors (1).

222121202102221 is an equidigital number, since it uses as much as digits as its factorization.

222121202102221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 222121202102221 its reverse (122201202121222), we get a palindrome (344322404223443).

The spelling of 222121202102221 in words is "two hundred twenty-two trillion, one hundred twenty-one billion, two hundred two million, one hundred two thousand, two hundred twenty-one".