1221443 has 2 divisors, whose sum is σ = 1221444. Its totient is φ = 1221442.

The previous prime is 1221427. The next prime is 1221449. The reversal of 1221443 is 3441221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1221443 - 2⁴ = 1221427 is a prime.

It is not a weakly prime, because it can be changed into another prime (1221449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610721 + 610722.

It is an arithmetic number, because the mean of its divisors is an integer number (610722).

2^1221443 is an apocalyptic number.

1221443 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221443 is an equidigital number, since it uses as much as digits as its factorization.

1221443 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 192, while the sum is 17.

The square root of 1221443 is about 1105.1891240869. The cubic root of 1221443 is about 106.8950845146.

Adding to 1221443 its reverse (3441221), we get a palindrome (4662664).

The spelling of 1221443 in words is "one million, two hundred twenty-one thousand, four hundred forty-three".