1213451305303 has 4 divisors (see below), whose sum is σ = 1217328146848. Its totient is φ = 1209574463760.

The previous prime is 1213451305277. The next prime is 1213451305307. The reversal of 1213451305303 is 3035031543121.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1213451305303 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213451305307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1938420303 + ... + 1938420928.

It is an arithmetic number, because the mean of its divisors is an integer number (304332036712).

Almost surely, 2^{1213451305303} is an apocalyptic number.

1213451305303 is a deficient number, since it is larger than the sum of its proper divisors (3876841545).

1213451305303 is an equidigital number, since it uses as much as digits as its factorization.

1213451305303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3876841544.

The product of its (nonzero) digits is 16200, while the sum is 31.

Adding to 1213451305303 its reverse (3035031543121), we get a palindrome (4248482848424).

The spelling of 1213451305303 in words is "one trillion, two hundred thirteen billion, four hundred fifty-one million, three hundred five thousand, three hundred three".