1399588356821 has 2 divisors, whose sum is σ = 1399588356822. Its totient is φ = 1399588356820.

The previous prime is 1399588356799. The next prime is 1399588356869. The reversal of 1399588356821 is 1286538859931.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1330123956100 + 69464400721 = 1153310^2 + 263561^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1399588356821 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1399588356421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 699794178410 + 699794178411.

It is an arithmetic number, because the mean of its divisors is an integer number (699794178411).

Almost surely, 2^{1399588356821} is an apocalyptic number.

It is an amenable number.

1399588356821 is a deficient number, since it is larger than the sum of its proper divisors (1).

1399588356821 is an equidigital number, since it uses as much as digits as its factorization.

1399588356821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 111974400, while the sum is 68.

The spelling of 1399588356821 in words is "one trillion, three hundred ninety-nine billion, five hundred eighty-eight million, three hundred fifty-six thousand, eight hundred twenty-one".