1321206612245 has 24 divisors (see below), whose sum is σ = 1729318259016. Its totient is φ = 968538574848.

The previous prime is 1321206612203. The next prime is 1321206612263. The reversal of 1321206612245 is 5422166021231.

It can be written as a sum of positive squares in 12 ways, for example, as 983718814276 + 337487797969 = 991826^2 + 580937^2 .

It is not a de Polignac number, because 1321206612245 - 2²⁴ = 1321189835029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 5590652 + ... + 5822181.

It is an arithmetic number, because the mean of its divisors is an integer number (72054927459).

Almost surely, 2^{1321206612245} is an apocalyptic number.

It is an amenable number.

1321206612245 is a deficient number, since it is larger than the sum of its proper divisors (408111646771).

1321206612245 is a wasteful number, since it uses less digits than its factorization.

1321206612245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11413001 (or 11412988 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 35.

The spelling of 1321206612245 in words is "one trillion, three hundred twenty-one billion, two hundred six million, six hundred twelve thousand, two hundred forty-five".