121221441 has 80 divisors (see below), whose sum is σ = 214524288. Its totient is φ = 67392000.

The previous prime is 121221403. The next prime is 121221449. The reversal of 121221441 is 144122121.

121221441 is a `hidden beast` number, since 1 + 2 + 1 + 221 + 441 = 666.

It is not a de Polignac number, because 121221441 - 2¹⁵ = 121188673 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (121221449) 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 in 79 ways as a sum of consecutive naturals, for example, 802716 + ... + 802866.

Almost surely, 2^121221441 is an apocalyptic number.

121221441 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121221441 is a deficient number, since it is larger than the sum of its proper divisors (93302847).

121221441 is a wasteful number, since it uses less digits than its factorization.

121221441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244 (or 235 counting only the distinct ones).

The product of its digits is 128, while the sum is 18.

The square root of 121221441 is about 11010.0608990141. The cubic root of 121221441 is about 494.9102867718.

Adding to 121221441 its reverse (144122121), we get a palindrome (265343562).

The spelling of 121221441 in words is "one hundred twenty-one million, two hundred twenty-one thousand, four hundred forty-one".