1221243 has 8 divisors (see below), whose sum is σ = 1666368. Its totient is φ = 795144.

The previous prime is 1221239. The next prime is 1221247. The reversal of 1221243 is 3421221.

It is an interprime number because it is at equal distance from previous prime (1221239) and next prime (1221247).

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

It is not a de Polignac number, because 1221243 - 2² = 1221239 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1221247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4605 + ... + 4862.

It is an arithmetic number, because the mean of its divisors is an integer number (208296).

2^1221243 is an apocalyptic number.

1221243 is a deficient number, since it is larger than the sum of its proper divisors (445125).

1221243 is an equidigital number, since it uses as much as digits as its factorization.

1221243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9513.

The product of its digits is 96, while the sum is 15.

The square root of 1221243 is about 1105.0986381315. The cubic root of 1221243 is about 106.8892498355.

Adding to 1221243 its reverse (3421221), we get a palindrome (4642464).

The spelling of 1221243 in words is "one million, two hundred twenty-one thousand, two hundred forty-three".