205541221 has 8 divisors (see below), whose sum is σ = 216508320. Its totient is φ = 194589072.

The previous prime is 205541201. The next prime is 205541243. The reversal of 205541221 is 122145502.

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 205541221 - 2⁷ = 205541093 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 205541192 and 205541201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205541201) 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, 34746 + ... + 40228.

It is an arithmetic number, because the mean of its divisors is an integer number (27063540).

Almost surely, 2^205541221 is an apocalyptic number.

It is an amenable number.

205541221 is a deficient number, since it is larger than the sum of its proper divisors (10967099).

205541221 is a wasteful number, since it uses less digits than its factorization.

205541221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7475.

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 205541221 is about 14336.7088622180. The cubic root of 205541221 is about 590.1552985809.

Adding to 205541221 its reverse (122145502), we get a palindrome (327686723).

The spelling of 205541221 in words is "two hundred five million, five hundred forty-one thousand, two hundred twenty-one".