1321337675261 has 4 divisors (see below), whose sum is σ = 1330205713500. Its totient is φ = 1312469637024.

The previous prime is 1321337675221. The next prime is 1321337675269. The reversal of 1321337675261 is 1625767331231.

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 200798987236 + 1120538688025 = 448106^2 + 1058555^2 .

It is a cyclic number.

It is not a de Polignac number, because 1321337675261 - 2¹⁴ = 1321337658877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321337675269) 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, 4434018896 + ... + 4434019193.

It is an arithmetic number, because the mean of its divisors is an integer number (332551428375).

Almost surely, 2^{1321337675261} is an apocalyptic number.

It is an amenable number.

1321337675261 is a deficient number, since it is larger than the sum of its proper divisors (8868038239).

1321337675261 is an equidigital number, since it uses as much as digits as its factorization.

1321337675261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8868038238.

The product of its digits is 952560, while the sum is 47.

The spelling of 1321337675261 in words is "one trillion, three hundred twenty-one billion, three hundred thirty-seven million, six hundred seventy-five thousand, two hundred sixty-one".