1221104461 has 2 divisors, whose sum is σ = 1221104462. Its totient is φ = 1221104460.

The previous prime is 1221104419. The next prime is 1221104513. The reversal of 1221104461 is 1644011221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1050148836 + 170955625 = 32406^2 + 13075^2 .

It is an emirp because it is prime and its reverse (1644011221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1221104461 - 2¹⁵ = 1221071693 is a prime.

It is a super-2 number, since 2×1221104461² = 2982192209348201042, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221104561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610552230 + 610552231.

It is an arithmetic number, because the mean of its divisors is an integer number (610552231).

Almost surely, 2^1221104461 is an apocalyptic number.

It is an amenable number.

1221104461 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221104461 is an equidigital number, since it uses as much as digits as its factorization.

1221104461 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 1221104461 is about 34944.3051297347. The cubic root of 1221104461 is about 1068.8520780902.

Adding to 1221104461 its reverse (1644011221), we get a palindrome (2865115682).

The spelling of 1221104461 in words is "one billion, two hundred twenty-one million, one hundred four thousand, four hundred sixty-one".