41243243221 has 2 divisors, whose sum is σ = 41243243222. Its totient is φ = 41243243220.

The previous prime is 41243243219. The next prime is 41243243263. The reversal of 41243243221 is 12234234214.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39836168100 + 1407075121 = 199590^2 + 37511^2 .

It is a cyclic number.

It is not a de Polignac number, because 41243243221 - 2¹ = 41243243219 is a prime.

It is a super-2 number, since 2×41243243221² (a number of 22 digits) contains 22 as substring.

Together with 41243243219, 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 41243243221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (41243243281) 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, 20621621610 + 20621621611.

It is an arithmetic number, because the mean of its divisors is an integer number (20621621611).

Almost surely, 2^41243243221 is an apocalyptic number.

It is an amenable number.

41243243221 is a deficient number, since it is larger than the sum of its proper divisors (1).

41243243221 is an equidigital number, since it uses as much as digits as its factorization.

41243243221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9216, while the sum is 28.

Adding to 41243243221 its reverse (12234234214), we get a palindrome (53477477435).

The spelling of 41243243221 in words is "forty-one billion, two hundred forty-three million, two hundred forty-three thousand, two hundred twenty-one".