1221304303323 has 36 divisors (see below), whose sum is σ = 1985998402752. Its totient is φ = 718894804320.

The previous prime is 1221304303301. The next prime is 1221304303333. The reversal of 1221304303323 is 3233034031221.

1221304303323 is a `hidden beast` number, since 1 + 2 + 2 + 1 + 30 + 4 + 303 + 323 = 666.

It is not a de Polignac number, because 1221304303323 - 2¹² = 1221304299227 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1221304303333) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 9804363 + ... + 9928148.

Almost surely, 2^{1221304303323} is an apocalyptic number.

1221304303323 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1221304303323 is a deficient number, since it is larger than the sum of its proper divisors (764694099429).

1221304303323 is a wasteful number, since it uses less digits than its factorization.

1221304303323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19732576 (or 19732550 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 27.

Adding to 1221304303323 its reverse (3233034031221), we get a palindrome (4454338334544).

The spelling of 1221304303323 in words is "one trillion, two hundred twenty-one billion, three hundred four million, three hundred three thousand, three hundred twenty-three".