1221300309 has 16 divisors (see below), whose sum is σ = 1638447104. Its totient is φ = 809190000.

The previous prime is 1221300307. The next prime is 1221300341. The reversal of 1221300309 is 9030031221.

It is a happy number.

It is not a de Polignac number, because 1221300309 - 2¹ = 1221300307 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221300307) 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 15 ways as a sum of consecutive naturals, for example, 541434 + ... + 543684.

It is an arithmetic number, because the mean of its divisors is an integer number (102402944).

Almost surely, 2^1221300309 is an apocalyptic number.

It is an amenable number.

1221300309 is a deficient number, since it is larger than the sum of its proper divisors (417146795).

1221300309 is a wasteful number, since it uses less digits than its factorization.

1221300309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3288.

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 1221300309 is about 34947.1073051834. The cubic root of 1221300309 is about 1068.9092179877.

The spelling of 1221300309 in words is "one billion, two hundred twenty-one million, three hundred thousand, three hundred nine".