1221350441 has 2 divisors, whose sum is σ = 1221350442. Its totient is φ = 1221350440.

The previous prime is 1221350387. The next prime is 1221350519. The reversal of 1221350441 is 1440531221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 829152025 + 392198416 = 28795^2 + 19804^2 .

It is an emirp because it is prime and its reverse (1440531221) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221350441 is a prime.

It is not a weakly prime, because it can be changed into another prime (1221350041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610675220 + 610675221.

It is an arithmetic number, because the mean of its divisors is an integer number (610675221).

Almost surely, 2^1221350441 is an apocalyptic number.

It is an amenable number.

1221350441 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221350441 is an equidigital number, since it uses as much as digits as its factorization.

1221350441 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 1221350441 is about 34947.8245531821. The cubic root of 1221350441 is about 1068.9238433351.

Adding to 1221350441 its reverse (1440531221), we get a palindrome (2661881662).

The spelling of 1221350441 in words is "one billion, two hundred twenty-one million, three hundred fifty thousand, four hundred forty-one".