1312542502021 has 4 divisors (see below), whose sum is σ = 1312903391692. Its totient is φ = 1312181612352.

The previous prime is 1312542502013. The next prime is 1312542502031. The reversal of 1312542502021 is 1202052452131.

It is a happy number.

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 173443096225 + 1139099405796 = 416465^2 + 1067286^2 .

It is a cyclic number.

It is not a de Polignac number, because 1312542502021 - 2³ = 1312542502013 is a prime.

It is a super-2 number, since 2×1312542502021² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312542502031) 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, 180439380 + ... + 180446653.

It is an arithmetic number, because the mean of its divisors is an integer number (328225847923).

Almost surely, 2^{1312542502021} is an apocalyptic number.

It is an amenable number.

1312542502021 is a deficient number, since it is larger than the sum of its proper divisors (360889671).

1312542502021 is an equidigital number, since it uses as much as digits as its factorization.

1312542502021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360889670.

The product of its (nonzero) digits is 4800, while the sum is 28.

Adding to 1312542502021 its reverse (1202052452131), we get a palindrome (2514594954152).

The spelling of 1312542502021 in words is "one trillion, three hundred twelve billion, five hundred forty-two million, five hundred two thousand, twenty-one".