1321413543253 has 8 divisors (see below), whose sum is σ = 1325731177368. Its totient is φ = 1317102925824.

The previous prime is 1321413543211. The next prime is 1321413543341. The reversal of 1321413543253 is 3523453141231.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 841986089604 + 479427453649 = 917598^2 + 692407^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1321413543253 - 2²¹ = 1321411446101 is a prime.

It is a super-2 number, since 2×1321413543253² (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 (1321413543353) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1376776 + ... + 2130337.

It is an arithmetic number, because the mean of its divisors is an integer number (165716397171).

Almost surely, 2^{1321413543253} is an apocalyptic number.

It is an amenable number.

1321413543253 is a deficient number, since it is larger than the sum of its proper divisors (4317634115).

1321413543253 is an equidigital number, since it uses as much as digits as its factorization.

1321413543253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3508343.

The product of its digits is 129600, while the sum is 37.

Adding to 1321413543253 its reverse (3523453141231), we get a palindrome (4844866684484).

The spelling of 1321413543253 in words is "one trillion, three hundred twenty-one billion, four hundred thirteen million, five hundred forty-three thousand, two hundred fifty-three".