121205417 has 4 divisors (see below), whose sum is σ = 121229136. Its totient is φ = 121181700.

The previous prime is 121205401. The next prime is 121205429. The reversal of 121205417 is 714502121.

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, and also an emirpimes, since its reverse is a distinct semiprime: 714502121 = 41 ⋅17426881.

It is a cyclic number.

It is not a de Polignac number, because 121205417 - 2⁴ = 121205401 is a prime.

It is a super-2 number, since 2×121205417² = 29381506220287778, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121205392 and 121205401.

It is not an unprimeable number, because it can be changed into a prime (121205437) 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, 683 + ... + 15584.

It is an arithmetic number, because the mean of its divisors is an integer number (30307284).

Almost surely, 2^121205417 is an apocalyptic number.

It is an amenable number.

121205417 is a deficient number, since it is larger than the sum of its proper divisors (23719).

121205417 is an equidigital number, since it uses as much as digits as its factorization.

121205417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23718.

The product of its (nonzero) digits is 560, while the sum is 23.

The square root of 121205417 is about 11009.3331769004. Note that the first 3 decimals coincide. The cubic root of 121205417 is about 494.8884787708. Note that the first 3 decimals are identical.

Adding to 121205417 its reverse (714502121), we get a palindrome (835707538).

The spelling of 121205417 in words is "one hundred twenty-one million, two hundred five thousand, four hundred seventeen".