11222210261 has 2 divisors, whose sum is σ = 11222210262. Its totient is φ = 11222210260.

The previous prime is 11222210249. The next prime is 11222210399. The reversal of 11222210261 is 16201222211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11194909636 + 27300625 = 105806^2 + 5225^2 .

It is an emirp because it is prime and its reverse (16201222211) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11222210261 - 2¹⁰ = 11222209237 is a prime.

It is a super-3 number, since 3×11222210261³ (a number of 31 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11222210861) 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, 5611105130 + 5611105131.

It is an arithmetic number, because the mean of its divisors is an integer number (5611105131).

Almost surely, 2^11222210261 is an apocalyptic number.

It is an amenable number.

11222210261 is a deficient number, since it is larger than the sum of its proper divisors (1).

11222210261 is an equidigital number, since it uses as much as digits as its factorization.

11222210261 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 20.

Adding to 11222210261 its reverse (16201222211), we get a palindrome (27423432472).

The spelling of 11222210261 in words is "eleven billion, two hundred twenty-two million, two hundred ten thousand, two hundred sixty-one".