1022221221181 has 2 divisors, whose sum is σ = 1022221221182. Its totient is φ = 1022221221180.

The previous prime is 1022221221167. The next prime is 1022221221223. The reversal of 1022221221181 is 1811221222201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 880913644900 + 141307576281 = 938570^2 + 375909^2 .

It is a cyclic number.

It is not a de Polignac number, because 1022221221181 - 2³¹ = 1020073737533 is a prime.

It is a super-2 number, since 2×1022221221181² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1022221261181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 511110610590 + 511110610591.

It is an arithmetic number, because the mean of its divisors is an integer number (511110610591).

Almost surely, 2^{1022221221181} is an apocalyptic number.

It is an amenable number.

1022221221181 is a deficient number, since it is larger than the sum of its proper divisors (1).

1022221221181 is an equidigital number, since it uses as much as digits as its factorization.

1022221221181 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 25.

Adding to 1022221221181 its reverse (1811221222201), we get a palindrome (2833442443382).

The spelling of 1022221221181 in words is "one trillion, twenty-two billion, two hundred twenty-one million, two hundred twenty-one thousand, one hundred eighty-one".