1221433443 has 12 divisors (see below), whose sum is σ = 1764597120. Its totient is φ = 814148496.

The previous prime is 1221433429. The next prime is 1221433453. The reversal of 1221433443 is 3443341221.

1221433443 is a `hidden beast` number, since 1 + 2 + 214 + 3 + 3 + 443 = 666.

It is not a de Polignac number, because 1221433443 - 2¹² = 1221429347 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1221433453) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 88605 + ... + 101457.

It is an arithmetic number, because the mean of its divisors is an integer number (147049760).

Almost surely, 2^1221433443 is an apocalyptic number.

1221433443 is a deficient number, since it is larger than the sum of its proper divisors (543163677).

1221433443 is a wasteful number, since it uses less digits than its factorization.

1221433443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23418 (or 23415 counting only the distinct ones).

The product of its digits is 6912, while the sum is 27.

The square root of 1221433443 is about 34949.0120461223. The cubic root of 1221433443 is about 1068.9480571900.

Adding to 1221433443 its reverse (3443341221), we get a palindrome (4664774664).

The spelling of 1221433443 in words is "one billion, two hundred twenty-one million, four hundred thirty-three thousand, four hundred forty-three".