121243217 has 4 divisors (see below), whose sum is σ = 122198016. Its totient is φ = 120288420.

The previous prime is 121243193. The next prime is 121243223. The reversal of 121243217 is 712342121.

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 121243217 - 2⁶ = 121243153 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121243192 and 121243201.

It is not an unprimeable number, because it can be changed into a prime (121243247) 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, 477209 + ... + 477462.

It is an arithmetic number, because the mean of its divisors is an integer number (30549504).

Almost surely, 2^121243217 is an apocalyptic number.

It is an amenable number.

121243217 is a deficient number, since it is larger than the sum of its proper divisors (954799).

121243217 is an equidigital number, since it uses as much as digits as its factorization.

121243217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 954798.

The product of its digits is 672, while the sum is 23.

The square root of 121243217 is about 11011.0497683009. The cubic root of 121243217 is about 494.9399199265.

Adding to 121243217 its reverse (712342121), we get a palindrome (833585338).

The spelling of 121243217 in words is "one hundred twenty-one million, two hundred forty-three thousand, two hundred seventeen".