1221017 has 4 divisors (see below), whose sum is σ = 1395456. Its totient is φ = 1046580.

The previous prime is 1220993. The next prime is 1221019. The reversal of 1221017 is 7101221.

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 1221017 - 2⁶ = 1220953 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1220992 and 1221010.

It is not an unprimeable number, because it can be changed into a prime (1221019) 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, 87209 + ... + 87222.

It is an arithmetic number, because the mean of its divisors is an integer number (348864).

2^1221017 is an apocalyptic number.

It is an amenable number.

1221017 is a deficient number, since it is larger than the sum of its proper divisors (174439).

1221017 is an equidigital number, since it uses as much as digits as its factorization.

1221017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174438.

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

The square root of 1221017 is about 1104.9963800846. The cubic root of 1221017 is about 106.8826558815.

Adding to 1221017 its reverse (7101221), we get a palindrome (8322238).

The spelling of 1221017 in words is "one million, two hundred twenty-one thousand, seventeen".