211222202122181 has 2 divisors, whose sum is σ = 211222202122182. Its totient is φ = 211222202122180.

The previous prime is 211222202122147. The next prime is 211222202122237. The reversal of 211222202122181 is 181221202222112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 116454508205281 + 94767693916900 = 10791409^2 + 9734870^2 .

It is a cyclic number.

It is not a de Polignac number, because 211222202122181 - 2⁶ = 211222202122117 is a prime.

It is a super-4 number, since 4×211222202122181⁴ (a number of 58 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211222202182181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105611101061090 + 105611101061091.

It is an arithmetic number, because the mean of its divisors is an integer number (105611101061091).

Almost surely, 2^{211222202122181} is an apocalyptic number.

It is an amenable number.

211222202122181 is a deficient number, since it is larger than the sum of its proper divisors (1).

211222202122181 is an equidigital number, since it uses as much as digits as its factorization.

211222202122181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2048, while the sum is 29.

Adding to 211222202122181 its reverse (181221202222112), we get a palindrome (392443404344293).

The spelling of 211222202122181 in words is "two hundred eleven trillion, two hundred twenty-two billion, two hundred two million, one hundred twenty-two thousand, one hundred eighty-one".