41635244321221 has 2 divisors, whose sum is σ = 41635244321222. Its totient is φ = 41635244321220.

The previous prime is 41635244321219. The next prime is 41635244321371. The reversal of 41635244321221 is 12212344253614.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32426362192225 + 9208882128996 = 5694415^2 + 3034614^2 .

It is a cyclic number.

It is not a de Polignac number, because 41635244321221 - 2¹ = 41635244321219 is a prime.

Together with 41635244321219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (41635244325221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20817622160610 + 20817622160611.

It is an arithmetic number, because the mean of its divisors is an integer number (20817622160611).

Almost surely, 2^{41635244321221} is an apocalyptic number.

It is an amenable number.

41635244321221 is a deficient number, since it is larger than the sum of its proper divisors (1).

41635244321221 is an equidigital number, since it uses as much as digits as its factorization.

41635244321221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 276480, while the sum is 40.

Adding to 41635244321221 its reverse (12212344253614), we get a palindrome (53847588574835).

The spelling of 41635244321221 in words is "forty-one trillion, six hundred thirty-five billion, two hundred forty-four million, three hundred twenty-one thousand, two hundred twenty-one".