206072821 has 8 divisors (see below), whose sum is σ = 208690560. Its totient is φ = 203467152.

The previous prime is 206072819. The next prime is 206072831. The reversal of 206072821 is 128270602.

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 206072821 - 2¹ = 206072819 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 206072821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206072831) 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, 34191 + ... + 39763.

It is an arithmetic number, because the mean of its divisors is an integer number (26086320).

Almost surely, 2^206072821 is an apocalyptic number.

It is an amenable number.

206072821 is a deficient number, since it is larger than the sum of its proper divisors (2617739).

206072821 is a wasteful number, since it uses less digits than its factorization.

206072821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6035.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 206072821 is about 14355.2367099954. The cubic root of 206072821 is about 590.6636418304.

The spelling of 206072821 in words is "two hundred six million, seventy-two thousand, eight hundred twenty-one".