122211011222221 has 2 divisors, whose sum is σ = 122211011222222. Its totient is φ = 122211011222220.

The previous prime is 122211011222213. The next prime is 122211011222233. The reversal of 122211011222221 is 122222110112221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73729939984996 + 48481071237225 = 8586614^2 + 6962835^2 .

It is a cyclic number.

It is not a de Polignac number, because 122211011222221 - 2³ = 122211011222213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 122211011222192 and 122211011222201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (122211011222281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61105505611110 + 61105505611111.

It is an arithmetic number, because the mean of its divisors is an integer number (61105505611111).

Almost surely, 2^{122211011222221} is an apocalyptic number.

It is an amenable number.

122211011222221 is a deficient number, since it is larger than the sum of its proper divisors (1).

122211011222221 is an equidigital number, since it uses as much as digits as its factorization.

122211011222221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 256, while the sum is 22.

Adding to 122211011222221 its reverse (122222110112221), we get a palindrome (244433121334442).

The spelling of 122211011222221 in words is "one hundred twenty-two trillion, two hundred eleven billion, eleven million, two hundred twenty-two thousand, two hundred twenty-one".