1321217 has 4 divisors (see below), whose sum is σ = 1349376. Its totient is φ = 1293060.

The previous prime is 1321213. The next prime is 1321219. The reversal of 1321217 is 7121231.

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: 7121231 = 13 ⋅547787.

It is a cyclic number.

It is not a de Polignac number, because 1321217 - 2² = 1321213 is a prime.

It is a super-2 number, since 2×1321217² = 3491228722178, 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 = 1321195 and 1321204.

It is not an unprimeable number, because it can be changed into a prime (1321213) 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, 14009 + ... + 14102.

It is an arithmetic number, because the mean of its divisors is an integer number (337344).

2^1321217 is an apocalyptic number.

It is an amenable number.

1321217 is a deficient number, since it is larger than the sum of its proper divisors (28159).

1321217 is an equidigital number, since it uses as much as digits as its factorization.

1321217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28158.

The product of its digits is 84, while the sum is 17.

The square root of 1321217 is about 1149.4420385561. The cubic root of 1321217 is about 109.7298328630.

Adding to 1321217 its reverse (7121231), we get a palindrome (8442448).

The spelling of 1321217 in words is "one million, three hundred twenty-one thousand, two hundred seventeen".