121305641 has 2 divisors, whose sum is σ = 121305642. Its totient is φ = 121305640.

The previous prime is 121305631. The next prime is 121305643. The reversal of 121305641 is 146503121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 103958416 + 17347225 = 10196^2 + 4165^2 .

It is an emirp because it is prime and its reverse (146503121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121305641 - 2¹⁴ = 121289257 is a prime.

Together with 121305643, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (121305643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60652820 + 60652821.

It is an arithmetic number, because the mean of its divisors is an integer number (60652821).

Almost surely, 2^121305641 is an apocalyptic number.

It is an amenable number.

121305641 is a deficient number, since it is larger than the sum of its proper divisors (1).

121305641 is an equidigital number, since it uses as much as digits as its factorization.

121305641 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 121305641 is about 11013.8840106477. The cubic root of 121305641 is about 495.0248479177.

Adding to 121305641 its reverse (146503121), we get a palindrome (267808762).

It can be divided in two parts, 12130 and 5641, that added together give a palindrome (17771).

The spelling of 121305641 in words is "one hundred twenty-one million, three hundred five thousand, six hundred forty-one".