1321747773253 has 2 divisors, whose sum is σ = 1321747773254. Its totient is φ = 1321747773252.

The previous prime is 1321747773239. The next prime is 1321747773271. The reversal of 1321747773253 is 3523777471231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1025182575169 + 296565198084 = 1012513^2 + 544578^2 .

It is an emirp because it is prime and its reverse (3523777471231) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1321747773253 - 2¹⁷ = 1321747642181 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1321747773253.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1321747773653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660873886626 + 660873886627.

It is an arithmetic number, because the mean of its divisors is an integer number (660873886627).

Almost surely, 2^{1321747773253} is an apocalyptic number.

It is an amenable number.

1321747773253 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321747773253 is an equidigital number, since it uses as much as digits as its factorization.

1321747773253 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5186160, while the sum is 52.

The spelling of 1321747773253 in words is "one trillion, three hundred twenty-one billion, seven hundred forty-seven million, seven hundred seventy-three thousand, two hundred fifty-three".