1221223443 has 16 divisors (see below), whose sum is σ = 1824335616. Its totient is φ = 720131040.

The previous prime is 1221223439. The next prime is 1221223447. The reversal of 1221223443 is 3443221221.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1221223439) and next prime (1221223447).

It is not a de Polignac number, because 1221223443 - 2² = 1221223439 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1221223447) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 498871 + ... + 501312.

It is an arithmetic number, because the mean of its divisors is an integer number (114020976).

Almost surely, 2^1221223443 is an apocalyptic number.

1221223443 is a deficient number, since it is larger than the sum of its proper divisors (603112173).

1221223443 is a wasteful number, since it uses less digits than its factorization.

1221223443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1000234.

The product of its digits is 2304, while the sum is 24.

The square root of 1221223443 is about 34946.0075402041. The cubic root of 1221223443 is about 1068.8867925725.

Adding to 1221223443 its reverse (3443221221), we get a palindrome (4664444664).

The spelling of 1221223443 in words is "one billion, two hundred twenty-one million, two hundred twenty-three thousand, four hundred forty-three".