1221333409 has 8 divisors (see below), whose sum is σ = 1246145472. Its totient is φ = 1196732880.

The previous prime is 1221333389. The next prime is 1221333413. The reversal of 1221333409 is 9043331221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1221333409 - 2⁹ = 1221332897 is a prime.

It is a super-2 number, since 2×1221333409² = 2983310591879122562, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221333439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41194 + ... + 64339.

It is an arithmetic number, because the mean of its divisors is an integer number (155768184).

Almost surely, 2^1221333409 is an apocalyptic number.

It is an amenable number.

1221333409 is a deficient number, since it is larger than the sum of its proper divisors (24812063).

1221333409 is a wasteful number, since it uses less digits than its factorization.

1221333409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105767.

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 1221333409 is about 34947.5808747902. The cubic root of 1221333409 is about 1068.9188745195.

The spelling of 1221333409 in words is "one billion, two hundred twenty-one million, three hundred thirty-three thousand, four hundred nine".