1039216379821 has 2 divisors, whose sum is σ = 1039216379822. Its totient is φ = 1039216379820.

The previous prime is 1039216379759. The next prime is 1039216379869. The reversal of 1039216379821 is 1289736129301.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 845452665225 + 193763714596 = 919485^2 + 440186^2 .

It is an emirp because it is prime and its reverse (1289736129301) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1039216379821 - 2⁷ = 1039216379693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1039216379881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 519608189910 + 519608189911.

It is an arithmetic number, because the mean of its divisors is an integer number (519608189911).

Almost surely, 2^{1039216379821} is an apocalyptic number.

It is an amenable number.

1039216379821 is a deficient number, since it is larger than the sum of its proper divisors (1).

1039216379821 is an equidigital number, since it uses as much as digits as its factorization.

1039216379821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 979776, while the sum is 52.

The spelling of 1039216379821 in words is "one trillion, thirty-nine billion, two hundred sixteen million, three hundred seventy-nine thousand, eight hundred twenty-one".