1221430241 has 4 divisors (see below), whose sum is σ = 1236146352. Its totient is φ = 1206714132.

The previous prime is 1221430201. The next prime is 1221430289. The reversal of 1221430241 is 1420341221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1221430241 - 2¹⁸ = 1221168097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221430201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7357931 + ... + 7358096.

It is an arithmetic number, because the mean of its divisors is an integer number (309036588).

Almost surely, 2^1221430241 is an apocalyptic number.

It is an amenable number.

1221430241 is a deficient number, since it is larger than the sum of its proper divisors (14716111).

1221430241 is an equidigital number, since it uses as much as digits as its factorization.

1221430241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14716110.

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

The square root of 1221430241 is about 34948.9662364998. The cubic root of 1221430241 is about 1068.9471231032.

Adding to 1221430241 its reverse (1420341221), we get a palindrome (2641771462).

The spelling of 1221430241 in words is "one billion, two hundred twenty-one million, four hundred thirty thousand, two hundred forty-one".