121221617 has 8 divisors (see below), whose sum is σ = 132338880. Its totient is φ = 110120560.

The previous prime is 121221613. The next prime is 121221623. The reversal of 121221617 is 716122121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 121221617 - 2² = 121221613 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121221592 and 121221601.

It is not an unprimeable number, because it can be changed into a prime (121221613) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15884 + ... + 22242.

It is an arithmetic number, because the mean of its divisors is an integer number (16542360).

Almost surely, 2^121221617 is an apocalyptic number.

It is an amenable number.

121221617 is a deficient number, since it is larger than the sum of its proper divisors (11117263).

121221617 is a wasteful number, since it uses less digits than its factorization.

121221617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8103.

The product of its digits is 336, while the sum is 23.

The square root of 121221617 is about 11010.0688917009. The cubic root of 121221617 is about 494.9105262898.

Adding to 121221617 its reverse (716122121), we get a palindrome (837343738).

The spelling of 121221617 in words is "one hundred twenty-one million, two hundred twenty-one thousand, six hundred seventeen".