1243103321213 has 4 divisors (see below), whose sum is σ = 1338726653628. Its totient is φ = 1147479988800.

The previous prime is 1243103321197. The next prime is 1243103321219. The reversal of 1243103321213 is 3121233013421.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 643503982969 + 599599338244 = 802187^2 + 774338^2 .

It is a cyclic number.

It is not a de Polignac number, because 1243103321213 - 2⁴ = 1243103321197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243103321219) 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, 47811666188 + ... + 47811666213.

It is an arithmetic number, because the mean of its divisors is an integer number (334681663407).

Almost surely, 2^{1243103321213} is an apocalyptic number.

1243103321213 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1243103321213 is a deficient number, since it is larger than the sum of its proper divisors (95623332415).

1243103321213 is an equidigital number, since it uses as much as digits as its factorization.

1243103321213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95623332414.

The product of its (nonzero) digits is 2592, while the sum is 26.

Adding to 1243103321213 its reverse (3121233013421), we get a palindrome (4364336334634).

The spelling of 1243103321213 in words is "one trillion, two hundred forty-three billion, one hundred three million, three hundred twenty-one thousand, two hundred thirteen".