1369312181821 has 2 divisors, whose sum is σ = 1369312181822. Its totient is φ = 1369312181820.

The previous prime is 1369312181791. The next prime is 1369312181869. The reversal of 1369312181821 is 1281812139631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1245980575225 + 123331606596 = 1116235^2 + 351186^2 .

It is a cyclic number.

It is not a de Polignac number, because 1369312181821 - 2¹¹ = 1369312179773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1369310181821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 684656090910 + 684656090911.

It is an arithmetic number, because the mean of its divisors is an integer number (684656090911).

Almost surely, 2^{1369312181821} is an apocalyptic number.

It is an amenable number.

1369312181821 is a deficient number, since it is larger than the sum of its proper divisors (1).

1369312181821 is an equidigital number, since it uses as much as digits as its factorization.

1369312181821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 124416, while the sum is 46.

The spelling of 1369312181821 in words is "one trillion, three hundred sixty-nine billion, three hundred twelve million, one hundred eighty-one thousand, eight hundred twenty-one".