206506121 has 8 divisors (see below), whose sum is σ = 216734400. Its totient is φ = 196382032.

The previous prime is 206506099. The next prime is 206506141. The reversal of 206506121 is 121605602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 206506121 - 2¹⁰ = 206505097 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is not an unprimeable number, because it can be changed into a prime (206506141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21971 + ... + 29928.

It is an arithmetic number, because the mean of its divisors is an integer number (27091800).

Almost surely, 2^206506121 is an apocalyptic number.

It is an amenable number.

206506121 is a deficient number, since it is larger than the sum of its proper divisors (10228279).

206506121 is a wasteful number, since it uses less digits than its factorization.

206506121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52095.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 206506121 is about 14370.3208384503. The cubic root of 206506121 is about 591.0773392527.

The spelling of 206506121 in words is "two hundred six million, five hundred six thousand, one hundred twenty-one".