1321203113 has 2 divisors, whose sum is σ = 1321203114. Its totient is φ = 1321203112.

The previous prime is 1321203109. The next prime is 1321203137. The reversal of 1321203113 is 3113021231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 746546329 + 574656784 = 27323^2 + 23972^2 .

It is an emirp because it is prime and its reverse (3113021231) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1321203113 - 2² = 1321203109 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1321203091 and 1321203100.

It is not a weakly prime, because it can be changed into another prime (1321203193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660601556 + 660601557.

It is an arithmetic number, because the mean of its divisors is an integer number (660601557).

Almost surely, 2^1321203113 is an apocalyptic number.

It is an amenable number.

1321203113 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321203113 is an equidigital number, since it uses as much as digits as its factorization.

1321203113 is an odious number, because the sum of its binary digits is odd.

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

The square root of 1321203113 is about 36348.3577758336. The cubic root of 1321203113 is about 1097.2944841352.

Adding to 1321203113 its reverse (3113021231), we get a palindrome (4434224344).

The spelling of 1321203113 in words is "one billion, three hundred twenty-one million, two hundred three thousand, one hundred thirteen".