121217353 has 2 divisors, whose sum is σ = 121217354. Its totient is φ = 121217352.

The previous prime is 121217351. The next prime is 121217381. The reversal of 121217353 is 353712121.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68029504 + 53187849 = 8248^2 + 7293^2 .

It is a cyclic number.

It is not a de Polignac number, because 121217353 - 2¹ = 121217351 is a prime.

Together with 121217351, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (121217351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60608676 + 60608677.

It is an arithmetic number, because the mean of its divisors is an integer number (60608677).

Almost surely, 2^121217353 is an apocalyptic number.

It is an amenable number.

121217353 is a deficient number, since it is larger than the sum of its proper divisors (1).

121217353 is an equidigital number, since it uses as much as digits as its factorization.

121217353 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1260, while the sum is 25.

The square root of 121217353 is about 11009.8752490662. The cubic root of 121217353 is about 494.9047233555.

Adding to 121217353 its reverse (353712121), we get a palindrome (474929474).

The spelling of 121217353 in words is "one hundred twenty-one million, two hundred seventeen thousand, three hundred fifty-three".