1311322202213 has 4 divisors (see below), whose sum is σ = 1311938137740. Its totient is φ = 1310706266688.

The previous prime is 1311322202207. The next prime is 1311322202233. The reversal of 1311322202213 is 3122022231131.

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 267447225409 + 1043874976804 = 517153^2 + 1021702^2 .

It is a cyclic number.

It is not a de Polignac number, because 1311322202213 - 2⁸ = 1311322201957 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311322202233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 307964570 + ... + 307968827.

It is an arithmetic number, because the mean of its divisors is an integer number (327984534435).

Almost surely, 2^{1311322202213} is an apocalyptic number.

It is an amenable number.

1311322202213 is a deficient number, since it is larger than the sum of its proper divisors (615935527).

1311322202213 is an equidigital number, since it uses as much as digits as its factorization.

1311322202213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 615935526.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 1311322202213 its reverse (3122022231131), we get a palindrome (4433344433344).

The spelling of 1311322202213 in words is "one trillion, three hundred eleven billion, three hundred twenty-two million, two hundred two thousand, two hundred thirteen".