206439921003 has 16 divisors (see below), whose sum is σ = 280932270080. Its totient is φ = 134814528576.

The previous prime is 206439921001. The next prime is 206439921007. The reversal of 206439921003 is 300129934602.

It is not a de Polignac number, because 206439921003 - 2¹ = 206439921001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (206439921001) 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 in 15 ways as a sum of consecutive naturals, for example, 3399250 + ... + 3459447.

It is an arithmetic number, because the mean of its divisors is an integer number (17558266880).

Almost surely, 2^206439921003 is an apocalyptic number.

206439921003 is a deficient number, since it is larger than the sum of its proper divisors (74492349077).

206439921003 is a wasteful number, since it uses less digits than its factorization.

206439921003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6858906.

The product of its (nonzero) digits is 69984, while the sum is 39.

The spelling of 206439921003 in words is "two hundred six billion, four hundred thirty-nine million, nine hundred twenty-one thousand, three".