206121 has 8 divisors (see below), whose sum is σ = 277504. Its totient is φ = 136080.

The previous prime is 206083. The next prime is 206123. The reversal of 206121 is 121602.

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

It is not a de Polignac number, because 206121 - 2⁷ = 205993 is a prime.

It is a Duffinian number.

206121 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 206097 and 206106.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 206121.

It is not an unprimeable number, because it can be changed into a prime (206123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 111 + ... + 651.

It is an arithmetic number, because the mean of its divisors is an integer number (34688).

2²⁰⁶¹²¹ is an apocalyptic number.

It is an amenable number.

206121 is a deficient number, since it is larger than the sum of its proper divisors (71383).

206121 is a wasteful number, since it uses less digits than its factorization.

206121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 671.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 206121 is about 454.0055065745. The cubic root of 206121 is about 59.0709669841.

Adding to 206121 its reverse (121602), we get a palindrome (327723).

The spelling of 206121 in words is "two hundred six thousand, one hundred twenty-one".