2144221213181 has 2 divisors, whose sum is σ = 2144221213182. Its totient is φ = 2144221213180.

The previous prime is 2144221213177. The next prime is 2144221213201. The reversal of 2144221213181 is 1813121224412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2108550847225 + 35670365956 = 1452085^2 + 188866^2 .

It is a cyclic number.

It is not a de Polignac number, because 2144221213181 - 2² = 2144221213177 is a prime.

It is a super-2 number, since 2×2144221213181² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2144221213681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1072110606590 + 1072110606591.

It is an arithmetic number, because the mean of its divisors is an integer number (1072110606591).

Almost surely, 2^{2144221213181} is an apocalyptic number.

It is an amenable number.

2144221213181 is a deficient number, since it is larger than the sum of its proper divisors (1).

2144221213181 is an equidigital number, since it uses as much as digits as its factorization.

2144221213181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6144, while the sum is 32.

Adding to 2144221213181 its reverse (1813121224412), we get a palindrome (3957342437593).

The spelling of 2144221213181 in words is "two trillion, one hundred forty-four billion, two hundred twenty-one million, two hundred thirteen thousand, one hundred eighty-one".