222202222220221 has 2 divisors, whose sum is σ = 222202222220222. Its totient is φ = 222202222220220.

The previous prime is 222202222220179. The next prime is 222202222220233. The reversal of 222202222220221 is 122022222202222.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 186801376300900 + 35400845919321 = 13667530^2 + 5949861^2 .

It is a cyclic number.

It is not a de Polignac number, because 222202222220221 - 2¹³ = 222202222212029 is a prime.

It is a super-2 number, since 2×222202222220221² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (222202222220821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111101111110110 + 111101111110111.

It is an arithmetic number, because the mean of its divisors is an integer number (111101111110111).

Almost surely, 2^{222202222220221} is an apocalyptic number.

It is an amenable number.

222202222220221 is a deficient number, since it is larger than the sum of its proper divisors (1).

222202222220221 is an equidigital number, since it uses as much as digits as its factorization.

222202222220221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4096, while the sum is 25.

Adding to 222202222220221 its reverse (122022222202222), we get a palindrome (344224444422443).

The spelling of 222202222220221 in words is "two hundred twenty-two trillion, two hundred two billion, two hundred twenty-two million, two hundred twenty thousand, two hundred twenty-one".