1213323403 has 4 divisors (see below), whose sum is σ = 1225336608. Its totient is φ = 1201310200.

The previous prime is 1213323379. The next prime is 1213323421. The reversal of 1213323403 is 3043233121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1213323403 - 2²⁵ = 1179768971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1213323493) 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 3 ways as a sum of consecutive naturals, for example, 6006451 + ... + 6006652.

It is an arithmetic number, because the mean of its divisors is an integer number (306334152).

Almost surely, 2^1213323403 is an apocalyptic number.

1213323403 is a deficient number, since it is larger than the sum of its proper divisors (12013205).

1213323403 is a wasteful number, since it uses less digits than its factorization.

1213323403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12013204.

The product of its (nonzero) digits is 1296, while the sum is 22.

The square root of 1213323403 is about 34832.7920643752. The cubic root of 1213323403 is about 1066.5769442870.

Adding to 1213323403 its reverse (3043233121), we get a palindrome (4256556524).

The spelling of 1213323403 in words is "one billion, two hundred thirteen million, three hundred twenty-three thousand, four hundred three".