1221076306 has 16 divisors (see below), whose sum is σ = 2041428960. Its totient is φ = 544380480.

The previous prime is 1221076301. The next prime is 1221076313. The reversal of 1221076306 is 6036701221.

It is not an unprimeable number, because it can be changed into a prime (1221076301) 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, 944460 + ... + 945751.

It is an arithmetic number, because the mean of its divisors is an integer number (127589310).

Almost surely, 2^1221076306 is an apocalyptic number.

1221076306 is a deficient number, since it is larger than the sum of its proper divisors (820352654).

1221076306 is a wasteful number, since it uses less digits than its factorization.

1221076306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1890249.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 1221076306 is about 34943.9022720703. The cubic root of 1221076306 is about 1068.8438631879.

Adding to 1221076306 its reverse (6036701221), we get a palindrome (7257777527).

The spelling of 1221076306 in words is "one billion, two hundred twenty-one million, seventy-six thousand, three hundred six".