206121552107 has 2 divisors, whose sum is σ = 206121552108. Its totient is φ = 206121552106.

The previous prime is 206121552071. The next prime is 206121552311. The reversal of 206121552107 is 701255121602.

Together with previous prime (206121552071) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-206121552107 is a prime.

It is a super-2 number, since 2×206121552107² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (206121552407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103060776053 + 103060776054.

It is an arithmetic number, because the mean of its divisors is an integer number (103060776054).

Almost surely, 2^206121552107 is an apocalyptic number.

206121552107 is a deficient number, since it is larger than the sum of its proper divisors (1).

206121552107 is an equidigital number, since it uses as much as digits as its factorization.

206121552107 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8400, while the sum is 32.

Adding to 206121552107 its reverse (701255121602), we get a palindrome (907376673709).

The spelling of 206121552107 in words is "two hundred six billion, one hundred twenty-one million, five hundred fifty-two thousand, one hundred seven".