1000206379021 has 2 divisors, whose sum is σ = 1000206379022. Its totient is φ = 1000206379020.

The previous prime is 1000206379013. The next prime is 1000206379061. The reversal of 1000206379021 is 1209736020001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 717968128900 + 282238250121 = 847330^2 + 531261^2 .

It is a cyclic number.

It is not a de Polignac number, because 1000206379021 - 2³ = 1000206379013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1000206379061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500103189510 + 500103189511.

It is an arithmetic number, because the mean of its divisors is an integer number (500103189511).

Almost surely, 2^{1000206379021} is an apocalyptic number.

It is an amenable number.

1000206379021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1000206379021 is an equidigital number, since it uses as much as digits as its factorization.

1000206379021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 31.

The spelling of 1000206379021 in words is "one trillion, two hundred six million, three hundred seventy-nine thousand, twenty-one".