2211444401261 has 2 divisors, whose sum is σ = 2211444401262. Its totient is φ = 2211444401260.

The previous prime is 2211444401183. The next prime is 2211444401273. The reversal of 2211444401261 is 1621044441122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1975121052100 + 236323349161 = 1405390^2 + 486131^2 .

It is a cyclic number.

It is not a de Polignac number, because 2211444401261 - 2³⁰ = 2210370659437 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2211444401281) 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, 1105722200630 + 1105722200631.

It is an arithmetic number, because the mean of its divisors is an integer number (1105722200631).

Almost surely, 2^{2211444401261} is an apocalyptic number.

It is an amenable number.

2211444401261 is a deficient number, since it is larger than the sum of its proper divisors (1).

2211444401261 is an equidigital number, since it uses as much as digits as its factorization.

2211444401261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12288, while the sum is 32.

Adding to 2211444401261 its reverse (1621044441122), we get a palindrome (3832488842383).

The spelling of 2211444401261 in words is "two trillion, two hundred eleven billion, four hundred forty-four million, four hundred one thousand, two hundred sixty-one".