1221443041 has 12 divisors (see below), whose sum is σ = 1530160212. Its totient is φ = 966415968.

The previous prime is 1221443039. The next prime is 1221443051. The reversal of 1221443041 is 1403441221.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 773062416 + 448380625 = 27804^2 + 21175^2 .

It is not a de Polignac number, because 1221443041 - 2¹ = 1221443039 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1221443021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 958110 + ... + 959383.

It is an arithmetic number, because the mean of its divisors is an integer number (127513351).

Almost surely, 2^1221443041 is an apocalyptic number.

It is an amenable number.

1221443041 is a deficient number, since it is larger than the sum of its proper divisors (308717171).

1221443041 is a wasteful number, since it uses less digits than its factorization.

1221443041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1917520 (or 1917513 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 1221443041 is about 34949.1493601776. The cubic root of 1221443041 is about 1068.9508571069.

Adding to 1221443041 its reverse (1403441221), we get a palindrome (2624884262).

It can be divided in two parts, 12214 and 43041, that added together give a palindrome (55255).

The spelling of 1221443041 in words is "one billion, two hundred twenty-one million, four hundred forty-three thousand, forty-one".