2144444221261 has 2 divisors, whose sum is σ = 2144444221262. Its totient is φ = 2144444221260.

The previous prime is 2144444221259. The next prime is 2144444221331. The reversal of 2144444221261 is 1621224444412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2077939548036 + 66504673225 = 1441506^2 + 257885^2 .

It is a cyclic number.

It is not a de Polignac number, because 2144444221261 - 2¹ = 2144444221259 is a prime.

Together with 2144444221259, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 2144444221261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2144444221861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1072222110630 + 1072222110631.

It is an arithmetic number, because the mean of its divisors is an integer number (1072222110631).

Almost surely, 2^{2144444221261} is an apocalyptic number.

It is an amenable number.

2144444221261 is a deficient number, since it is larger than the sum of its proper divisors (1).

2144444221261 is an equidigital number, since it uses as much as digits as its factorization.

2144444221261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 98304, while the sum is 37.

Adding to 2144444221261 its reverse (1621224444412), we get a palindrome (3765668665673).

The spelling of 2144444221261 in words is "two trillion, one hundred forty-four billion, four hundred forty-four million, two hundred twenty-one thousand, two hundred sixty-one".