121217 has 4 divisors (see below), whose sum is σ = 124080. Its totient is φ = 118356.

The previous prime is 121189. The next prime is 121229. The reversal of 121217 is 712121.

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 121217 - 2¹⁰ = 120193 is a prime.

It is a super-2 number, since 2×121217² = 29387122178, which contains 22 as substring.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 121217.

It is not an unprimeable number, because it can be changed into a prime (121267) 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, 1367 + ... + 1452.

It is an arithmetic number, because the mean of its divisors is an integer number (31020).

2¹²¹²¹⁷ is an apocalyptic number.

It is an amenable number.

121217 is a deficient number, since it is larger than the sum of its proper divisors (2863).

121217 is an equidigital number, since it uses as much as digits as its factorization.

121217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2862.

The product of its digits is 28, while the sum is 14.

The square root of 121217 is about 348.1623184665. The cubic root of 121217 is about 49.4904242947.

Adding to 121217 its reverse (712121), we get a palindrome (833338).

The spelling of 121217 in words is "one hundred twenty-one thousand, two hundred seventeen", and thus it is an iban number.