206211405121 has 8 divisors (see below), whose sum is σ = 206478927360. Its totient is φ = 205943950752.

The previous prime is 206211405091. The next prime is 206211405157. The reversal of 206211405121 is 121504112602.

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 206211405121 - 2²⁵ = 206177850689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (206211405821) 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, 9190965 + ... + 9213373.

It is an arithmetic number, because the mean of its divisors is an integer number (25809865920).

Almost surely, 2^206211405121 is an apocalyptic number.

It is an amenable number.

206211405121 is a deficient number, since it is larger than the sum of its proper divisors (267522239).

206211405121 is a wasteful number, since it uses less digits than its factorization.

206211405121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33935.

The product of its (nonzero) digits is 960, while the sum is 25.

Adding to 206211405121 its reverse (121504112602), we get a palindrome (327715517723).

The spelling of 206211405121 in words is "two hundred six billion, two hundred eleven million, four hundred five thousand, one hundred twenty-one".