1321258517072 has 20 divisors (see below), whose sum is σ = 2756856713940. Its totient is φ = 609811623168.

The previous prime is 1321258517041. The next prime is 1321258517077. The reversal of 1321258517072 is 2707158521231.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 658525758016 + 662732759056 = 811496^2 + 814084^2 .

It is a super-3 number, since 3×1321258517072³ (a number of 37 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321258517077) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3176101997 + ... + 3176102412.

It is an arithmetic number, because the mean of its divisors is an integer number (137842835697).

Almost surely, 2^{1321258517072} is an apocalyptic number.

It is an amenable number.

1321258517072 is an abundant number, since it is smaller than the sum of its proper divisors (1435598196868).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1321258517072 is a wasteful number, since it uses less digits than its factorization.

1321258517072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6352204430 (or 6352204424 counting only the distinct ones).

The product of its (nonzero) digits is 235200, while the sum is 44.

The spelling of 1321258517072 in words is "one trillion, three hundred twenty-one billion, two hundred fifty-eight million, five hundred seventeen thousand, seventy-two".