2211320561 has 2 divisors, whose sum is σ = 2211320562. Its totient is φ = 2211320560.

The previous prime is 2211320549. The next prime is 2211320597. The reversal of 2211320561 is 1650231122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1273062400 + 938258161 = 35680^2 + 30631^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2211320561 is a prime.

It is not a weakly prime, because it can be changed into another prime (2211320261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1105660280 + 1105660281.

It is an arithmetic number, because the mean of its divisors is an integer number (1105660281).

Almost surely, 2^2211320561 is an apocalyptic number.

It is an amenable number.

2211320561 is a deficient number, since it is larger than the sum of its proper divisors (1).

2211320561 is an equidigital number, since it uses as much as digits as its factorization.

2211320561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 2211320561 is about 47024.6803391581. The cubic root of 2211320561 is about 1302.8184533063.

Adding to 2211320561 its reverse (1650231122), we get a palindrome (3861551683).

The spelling of 2211320561 in words is "two billion, two hundred eleven million, three hundred twenty thousand, five hundred sixty-one".