1312201321 has 12 divisors (see below), whose sum is σ = 1397563468. Its totient is φ = 1231794432.

The previous prime is 1312201301. The next prime is 1312201327. The reversal of 1312201321 is 1231022131.

It can be written as a sum of positive squares in 6 ways, for example, as 98724096 + 1213477225 = 9936^2 + 34835^2 .

It is not a de Polignac number, because 1312201321 - 2¹⁵ = 1312168553 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1312201295 and 1312201304.

It is not an unprimeable number, because it can be changed into a prime (1312201327) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 109015 + ... + 120451.

Almost surely, 2^1312201321 is an apocalyptic number.

It is an amenable number.

1312201321 is a deficient number, since it is larger than the sum of its proper divisors (85362147).

1312201321 is a wasteful number, since it uses less digits than its factorization.

1312201321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11868 (or 11851 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1312201321 is about 36224.3194691080. The cubic root of 1312201321 is about 1094.7967265826.

Adding to 1312201321 its reverse (1231022131), we get a palindrome (2543223452).

The spelling of 1312201321 in words is "one billion, three hundred twelve million, two hundred one thousand, three hundred twenty-one".