1221312323 has 16 divisors (see below), whose sum is σ = 1532908800. Its totient is φ = 945276000.

The previous prime is 1221312289. The next prime is 1221312329. The reversal of 1221312323 is 3232131221.

It is a cyclic number.

It is not a de Polignac number, because 1221312323 - 2⁸ = 1221312067 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1221312295 and 1221312304.

It is not an unprimeable number, because it can be changed into a prime (1221312329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41753 + ... + 64698.

It is an arithmetic number, because the mean of its divisors is an integer number (95806800).

Almost surely, 2^1221312323 is an apocalyptic number.

1221312323 is a deficient number, since it is larger than the sum of its proper divisors (311596477).

1221312323 is a wasteful number, since it uses less digits than its factorization.

1221312323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106618.

The product of its digits is 432, while the sum is 20.

The square root of 1221312323 is about 34947.2791930931. The cubic root of 1221312323 is about 1068.9127229497.

Adding to 1221312323 its reverse (3232131221), we get a palindrome (4453443544).

The spelling of 1221312323 in words is "one billion, two hundred twenty-one million, three hundred twelve thousand, three hundred twenty-three".