1213326403 has 4 divisors (see below), whose sum is σ = 1236219408. Its totient is φ = 1190433400.

The previous prime is 1213326353. The next prime is 1213326419. The reversal of 1213326403 is 3046233121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3046233121 = 19 ⋅160328059.

It is a cyclic number.

It is not a de Polignac number, because 1213326403 - 2⁹ = 1213325891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1213326493) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11446423 + ... + 11446528.

It is an arithmetic number, because the mean of its divisors is an integer number (309054852).

Almost surely, 2^1213326403 is an apocalyptic number.

1213326403 is a deficient number, since it is larger than the sum of its proper divisors (22893005).

1213326403 is an equidigital number, since it uses as much as digits as its factorization.

1213326403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22893004.

The product of its (nonzero) digits is 2592, while the sum is 25.

The square root of 1213326403 is about 34832.8351272187. The cubic root of 1213326403 is about 1066.5778233404.

Adding to 1213326403 its reverse (3046233121), we get a palindrome (4259559524).

The spelling of 1213326403 in words is "one billion, two hundred thirteen million, three hundred twenty-six thousand, four hundred three".