206472221 has 4 divisors (see below), whose sum is σ = 217339200. Its totient is φ = 195605244.

The previous prime is 206472209. The next prime is 206472241. The reversal of 206472221 is 122274602.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 206472221 - 2¹⁰ = 206471197 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 (206472241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5433461 + ... + 5433498.

It is an arithmetic number, because the mean of its divisors is an integer number (54334800).

Almost surely, 2^206472221 is an apocalyptic number.

It is an amenable number.

206472221 is a deficient number, since it is larger than the sum of its proper divisors (10866979).

206472221 is a wasteful number, since it uses less digits than its factorization.

206472221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10866978.

The product of its (nonzero) digits is 2688, while the sum is 26.

The square root of 206472221 is about 14369.1412756643. The cubic root of 206472221 is about 591.0449937735.

The spelling of 206472221 in words is "two hundred six million, four hundred seventy-two thousand, two hundred twenty-one".