2243521524221 has 2 divisors, whose sum is σ = 2243521524222. Its totient is φ = 2243521524220.

The previous prime is 2243521524217. The next prime is 2243521524317. The reversal of 2243521524221 is 1224251253422.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2220904672900 + 22616851321 = 1490270^2 + 150389^2 .

It is a cyclic number.

It is not a de Polignac number, because 2243521524221 - 2² = 2243521524217 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2243521524721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1121760762110 + 1121760762111.

It is an arithmetic number, because the mean of its divisors is an integer number (1121760762111).

Almost surely, 2^{2243521524221} is an apocalyptic number.

It is an amenable number.

2243521524221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2243521524221 is an equidigital number, since it uses as much as digits as its factorization.

2243521524221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 76800, while the sum is 35.

Adding to 2243521524221 its reverse (1224251253422), we get a palindrome (3467772777643).

The spelling of 2243521524221 in words is "two trillion, two hundred forty-three billion, five hundred twenty-one million, five hundred twenty-four thousand, two hundred twenty-one".