206121552103 has 4 divisors (see below), whose sum is σ = 206139048120. Its totient is φ = 206104056088.

The previous prime is 206121552071. The next prime is 206121552107. The reversal of 206121552103 is 301255121602.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 206121552103 - 2⁵ = 206121552071 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206121552107) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8730325 + ... + 8753902.

It is an arithmetic number, because the mean of its divisors is an integer number (51534762030).

Almost surely, 2^206121552103 is an apocalyptic number.

206121552103 is a deficient number, since it is larger than the sum of its proper divisors (17496017).

206121552103 is a wasteful number, since it uses less digits than its factorization.

206121552103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17496016.

The product of its (nonzero) digits is 3600, while the sum is 28.

Adding to 206121552103 its reverse (301255121602), we get a palindrome (507376673705).

The spelling of 206121552103 in words is "two hundred six billion, one hundred twenty-one million, five hundred fifty-two thousand, one hundred three".