1321747773245 has 8 divisors (see below), whose sum is σ = 1586114016216. Its totient is φ = 1057387093056.

The previous prime is 1321747773239. The next prime is 1321747773253. The reversal of 1321747773245 is 5423777471231.

It can be written as a sum of positive squares in 4 ways, for example, as 24798060676 + 1296949712569 = 157474^2 + 1138837^2 .

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 1321747773245 - 2²⁴ = 1321730996029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 848762 + ... + 1834091.

It is an arithmetic number, because the mean of its divisors is an integer number (198264252027).

Almost surely, 2^{1321747773245} is an apocalyptic number.

It is an amenable number.

1321747773245 is a deficient number, since it is larger than the sum of its proper divisors (264366242971).

1321747773245 is an equidigital number, since it uses as much as digits as its factorization.

1321747773245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2781391.

The product of its digits is 6914880, while the sum is 53.

The spelling of 1321747773245 in words is "one trillion, three hundred twenty-one billion, seven hundred forty-seven million, seven hundred seventy-three thousand, two hundred forty-five".