206606346221 has 8 divisors (see below), whose sum is σ = 228104269344. Its totient is φ = 185561011120.

The previous prime is 206606346209. The next prime is 206606346227. The reversal of 206606346221 is 122643606602.

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 206606346221 - 2¹⁸ = 206606084077 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 (206606346227) 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, 113146046 + ... + 113147871.

It is an arithmetic number, because the mean of its divisors is an integer number (28513033668).

Almost surely, 2^206606346221 is an apocalyptic number.

It is an amenable number.

206606346221 is a deficient number, since it is larger than the sum of its proper divisors (21497923123).

206606346221 is a wasteful number, since it uses less digits than its factorization.

206606346221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226294011.

The product of its (nonzero) digits is 124416, while the sum is 38.

The spelling of 206606346221 in words is "two hundred six billion, six hundred six million, three hundred forty-six thousand, two hundred twenty-one".