1221433441 has 4 divisors (see below), whose sum is σ = 1221620400. Its totient is φ = 1221246484.

The previous prime is 1221433429. The next prime is 1221433453. The reversal of 1221433441 is 1443341221.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1443341221 = 7 ⋅206191603.

It is an interprime number because it is at equal distance from previous prime (1221433429) and next prime (1221433453).

It is a cyclic number.

It is not a de Polignac number, because 1221433441 - 2²¹ = 1219336289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221433541) 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 3 ways as a sum of consecutive naturals, for example, 83311 + ... + 96868.

It is an arithmetic number, because the mean of its divisors is an integer number (305405100).

Almost surely, 2^1221433441 is an apocalyptic number.

It is an amenable number.

1221433441 is a deficient number, since it is larger than the sum of its proper divisors (186959).

1221433441 is an equidigital number, since it uses as much as digits as its factorization.

1221433441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186958.

The product of its digits is 2304, while the sum is 25.

The square root of 1221433441 is about 34949.0120175092. The cubic root of 1221433441 is about 1068.9480566066.

Adding to 1221433441 its reverse (1443341221), we get a palindrome (2664774662).

The spelling of 1221433441 in words is "one billion, two hundred twenty-one million, four hundred thirty-three thousand, four hundred forty-one".