1221333306 has 8 divisors (see below), whose sum is σ = 2442666624. Its totient is φ = 407111100.

The previous prime is 1221333287. The next prime is 1221333307. The reversal of 1221333306 is 6033331221.

It is a happy number.

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

1221333306 is an admirable number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1221333307) 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, 101777770 + ... + 101777781.

It is an arithmetic number, because the mean of its divisors is an integer number (305333328).

Almost surely, 2^1221333306 is an apocalyptic number.

1221333306 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221333306 is a wasteful number, since it uses less digits than its factorization.

1221333306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203555556.

The product of its (nonzero) digits is 1944, while the sum is 24.

The square root of 1221333306 is about 34947.5794011545. The cubic root of 1221333306 is about 1068.9188444707.

Adding to 1221333306 its reverse (6033331221), we get a palindrome (7254664527).

The spelling of 1221333306 in words is "one billion, two hundred twenty-one million, three hundred thirty-three thousand, three hundred six".