1312402221 has 48 divisors (see below), whose sum is σ = 2124573360. Its totient is φ = 775111680.

The previous prime is 1312402199. The next prime is 1312402229. The reversal of 1312402221 is 1222042131.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 686702025 + 625700196 = 26205^2 + 25014^2 .

It is not a de Polignac number, because 1312402221 - 2¹³ = 1312394029 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1312402194 and 1312402203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312402229) 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 47 ways as a sum of consecutive naturals, for example, 613065 + ... + 615201.

It is an arithmetic number, because the mean of its divisors is an integer number (44261945).

Almost surely, 2^1312402221 is an apocalyptic number.

It is an amenable number.

1312402221 is a deficient number, since it is larger than the sum of its proper divisors (812171139).

1312402221 is a wasteful number, since it uses less digits than its factorization.

1312402221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2366 (or 2363 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 1312402221 is about 36227.0923619327. The cubic root of 1312402221 is about 1094.8525954078.

Adding to 1312402221 its reverse (1222042131), we get a palindrome (2534444352).

The spelling of 1312402221 in words is "one billion, three hundred twelve million, four hundred two thousand, two hundred twenty-one".