1221343 has 4 divisors (see below), whose sum is σ = 1239640. Its totient is φ = 1203048.

The previous prime is 1221299. The next prime is 1221373. The reversal of 1221343 is 3431221.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1221343 - 2¹³ = 1213151 is a prime.

It is a Duffinian number.

1221343 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221373) 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, 9048 + ... + 9181.

It is an arithmetic number, because the mean of its divisors is an integer number (309910).

2^1221343 is an apocalyptic number.

1221343 is a deficient number, since it is larger than the sum of its proper divisors (18297).

1221343 is an equidigital number, since it uses as much as digits as its factorization.

1221343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18296.

The product of its digits is 144, while the sum is 16.

The square root of 1221343 is about 1105.1438820353. The cubic root of 1221343 is about 106.8921672547.

Adding to 1221343 its reverse (3431221), we get a palindrome (4652564).

The spelling of 1221343 in words is "one million, two hundred twenty-one thousand, three hundred forty-three".