1221313323 has 8 divisors (see below), whose sum is σ = 1645205968. Its totient is φ = 805814784.

The previous prime is 1221313309. The next prime is 1221313343. The reversal of 1221313323 is 3233131221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1221313323 - 2⁶ = 1221313259 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1221313323.

It is not an unprimeable number, because it can be changed into a prime (1221313343) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2098186 + ... + 2098767.

It is an arithmetic number, because the mean of its divisors is an integer number (205650746).

Almost surely, 2^1221313323 is an apocalyptic number.

1221313323 is a deficient number, since it is larger than the sum of its proper divisors (423892645).

1221313323 is an equidigital number, since it uses as much as digits as its factorization.

1221313323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4197053.

The product of its digits is 648, while the sum is 21.

The square root of 1221313323 is about 34947.2935003556. The cubic root of 1221313323 is about 1068.9130146884.

Adding to 1221313323 its reverse (3233131221), we get a palindrome (4454444544).

The spelling of 1221313323 in words is "one billion, two hundred twenty-one million, three hundred thirteen thousand, three hundred twenty-three".