222221121122177 has 2 divisors, whose sum is σ = 222221121122178. Its totient is φ = 222221121122176.

The previous prime is 222221121122153. The next prime is 222221121122227. The reversal of 222221121122177 is 771221121122222.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 194239941126001 + 27981179996176 = 13936999^2 + 5289724^2 .

It is a cyclic number.

It is not a de Polignac number, because 222221121122177 - 2¹⁴ = 222221121105793 is a prime.

It is a super-2 number, since 2×222221121122177² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (222221121122137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111110560561088 + 111110560561089.

It is an arithmetic number, because the mean of its divisors is an integer number (111110560561089).

Almost surely, 2^{222221121122177} is an apocalyptic number.

It is an amenable number.

222221121122177 is a deficient number, since it is larger than the sum of its proper divisors (1).

222221121122177 is an equidigital number, since it uses as much as digits as its factorization.

222221121122177 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12544, while the sum is 35.

Adding to 222221121122177 its reverse (771221121122222), we get a palindrome (993442242244399).

The spelling of 222221121122177 in words is "two hundred twenty-two trillion, two hundred twenty-one billion, one hundred twenty-one million, one hundred twenty-two thousand, one hundred seventy-seven".