1221043241 has 16 divisors (see below), whose sum is σ = 1411525440. Its totient is φ = 1043911680.

The previous prime is 1221043223. The next prime is 1221043247. The reversal of 1221043241 is 1423401221.

It is a cyclic number.

It is not a de Polignac number, because 1221043241 - 2¹⁴ = 1221026857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221043247) 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 15 ways as a sum of consecutive naturals, for example, 396590 + ... + 399656.

It is an arithmetic number, because the mean of its divisors is an integer number (88220340).

Almost surely, 2^1221043241 is an apocalyptic number.

1221043241 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1221043241 is a deficient number, since it is larger than the sum of its proper divisors (190482199).

1221043241 is a wasteful number, since it uses less digits than its factorization.

1221043241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5224.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 1221043241 is about 34943.4291534188. The cubic root of 1221043241 is about 1068.8342155131.

Adding to 1221043241 its reverse (1423401221), we get a palindrome (2644444462).

The spelling of 1221043241 in words is "one billion, two hundred twenty-one million, forty-three thousand, two hundred forty-one".