11220220261 has 2 divisors, whose sum is σ = 11220220262. Its totient is φ = 11220220260.

The previous prime is 11220220211. The next prime is 11220220283. The reversal of 11220220261 is 16202202211.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11048112100 + 172108161 = 105110^2 + 13119^2 .

It is a cyclic number.

It is not a de Polignac number, because 11220220261 - 2¹⁹ = 11219695973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11220220211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5610110130 + 5610110131.

It is an arithmetic number, because the mean of its divisors is an integer number (5610110131).

Almost surely, 2^11220220261 is an apocalyptic number.

It is an amenable number.

11220220261 is a deficient number, since it is larger than the sum of its proper divisors (1).

11220220261 is an equidigital number, since it uses as much as digits as its factorization.

11220220261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 11220220261 its reverse (16202202211), we get a palindrome (27422422472).

The spelling of 11220220261 in words is "eleven billion, two hundred twenty million, two hundred twenty thousand, two hundred sixty-one".