1213365321 has 12 divisors (see below), whose sum is σ = 2003015872. Its totient is φ = 693351576.

The previous prime is 1213365319. The next prime is 1213365323. The reversal of 1213365321 is 1235633121.

1213365321 is a `hidden beast` number, since 1 + 2 + 1 + 3 + 3 + 653 + 2 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (1213365319) and next prime (1213365323).

It is not a de Polignac number, because 1213365321 - 2¹ = 1213365319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1213365323) 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 11 ways as a sum of consecutive naturals, for example, 9629821 + ... + 9629946.

Almost surely, 2^1213365321 is an apocalyptic number.

It is an amenable number.

1213365321 is a deficient number, since it is larger than the sum of its proper divisors (789650551).

1213365321 is a wasteful number, since it uses less digits than its factorization.

1213365321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19259780 (or 19259777 counting only the distinct ones).

The product of its digits is 3240, while the sum is 27.

The square root of 1213365321 is about 34833.3937623080. The cubic root of 1213365321 is about 1066.5892268759.

Adding to 1213365321 its reverse (1235633121), we get a palindrome (2448998442).

The spelling of 1213365321 in words is "one billion, two hundred thirteen million, three hundred sixty-five thousand, three hundred twenty-one".