1213103321 has 4 divisors (see below), whose sum is σ = 1254934500. Its totient is φ = 1171272144.

The previous prime is 1213103303. The next prime is 1213103327. The reversal of 1213103321 is 1233013121.

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 774787225 + 438316096 = 27835^2 + 20936^2 .

It is a cyclic number.

It is not a de Polignac number, because 1213103321 - 2⁶ = 1213103257 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 1213103321.

It is not an unprimeable number, because it can be changed into a prime (1213103327) 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, 20915546 + ... + 20915603.

It is an arithmetic number, because the mean of its divisors is an integer number (313733625).

Almost surely, 2^1213103321 is an apocalyptic number.

It is an amenable number.

1213103321 is a deficient number, since it is larger than the sum of its proper divisors (41831179).

1213103321 is an equidigital number, since it uses as much as digits as its factorization.

1213103321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41831178.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 1213103321 is about 34829.6328002464. The cubic root of 1213103321 is about 1066.5124523907.

Adding to 1213103321 its reverse (1233013121), we get a palindrome (2446116442).

The spelling of 1213103321 in words is "one billion, two hundred thirteen million, one hundred three thousand, three hundred twenty-one".