1221442441 has 2 divisors, whose sum is σ = 1221442442. Its totient is φ = 1221442440.

The previous prime is 1221442373. The next prime is 1221442447. The reversal of 1221442441 is 1442441221.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1214174025 + 7268416 = 34845^2 + 2696^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221442441 - 2¹⁷ = 1221311369 is a prime.

It is not a weakly prime, because it can be changed into another prime (1221442447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610721220 + 610721221.

It is an arithmetic number, because the mean of its divisors is an integer number (610721221).

Almost surely, 2^1221442441 is an apocalyptic number.

It is an amenable number.

1221442441 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221442441 is an equidigital number, since it uses as much as digits as its factorization.

1221442441 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2048, while the sum is 25.

The square root of 1221442441 is about 34949.1407762766. The cubic root of 1221442441 is about 1068.9506820761.

Adding to 1221442441 its reverse (1442441221), we get a palindrome (2663883662).

The spelling of 1221442441 in words is "one billion, two hundred twenty-one million, four hundred forty-two thousand, four hundred forty-one".