221144234369 has 2 divisors, whose sum is σ = 221144234370. Its totient is φ = 221144234368.

The previous prime is 221144234323. The next prime is 221144234387. The reversal of 221144234369 is 963432441122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 159130783744 + 62013450625 = 398912^2 + 249025^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221144234369 is a prime.

It is a super-2 number, since 2×221144234369² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (221144230369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110572117184 + 110572117185.

It is an arithmetic number, because the mean of its divisors is an integer number (110572117185).

Almost surely, 2^221144234369 is an apocalyptic number.

It is an amenable number.

221144234369 is a deficient number, since it is larger than the sum of its proper divisors (1).

221144234369 is an equidigital number, since it uses as much as digits as its factorization.

221144234369 is an evil number, because the sum of its binary digits is even.

The product of its digits is 248832, while the sum is 41.

The spelling of 221144234369 in words is "two hundred twenty-one billion, one hundred forty-four million, two hundred thirty-four thousand, three hundred sixty-nine".