1221304306 has 16 divisors (see below), whose sum is σ = 1969407360. Its totient is φ = 566202960.

The previous prime is 1221304297. The next prime is 1221304319. The reversal of 1221304306 is 6034031221.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 340125 + ... + 343696.

It is an arithmetic number, because the mean of its divisors is an integer number (123087960).

Almost surely, 2^1221304306 is an apocalyptic number.

1221304306 is a deficient number, since it is larger than the sum of its proper divisors (748103054).

1221304306 is a wasteful number, since it uses less digits than its factorization.

1221304306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 683889.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 1221304306 is about 34947.1644915578. The cubic root of 1221304306 is about 1068.9103840743.

Adding to 1221304306 its reverse (6034031221), we get a palindrome (7255335527).

The spelling of 1221304306 in words is "one billion, two hundred twenty-one million, three hundred four thousand, three hundred six".