121221317 has 4 divisors (see below), whose sum is σ = 138538656. Its totient is φ = 103903980.

The previous prime is 121221283. The next prime is 121221337. The reversal of 121221317 is 713122121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 121221317 - 2¹⁰ = 121220293 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121221337) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8658659 + ... + 8658672.

It is an arithmetic number, because the mean of its divisors is an integer number (34634664).

Almost surely, 2^121221317 is an apocalyptic number.

It is an amenable number.

121221317 is a deficient number, since it is larger than the sum of its proper divisors (17317339).

121221317 is an equidigital number, since it uses as much as digits as its factorization.

121221317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17317338.

The product of its digits is 168, while the sum is 20.

The square root of 121221317 is about 11010.0552677995. The cubic root of 121221317 is about 494.9101180203.

Adding to 121221317 its reverse (713122121), we get a palindrome (834343438).

The spelling of 121221317 in words is "one hundred twenty-one million, two hundred twenty-one thousand, three hundred seventeen".