205741021 has 8 divisors (see below), whose sum is σ = 219773304. Its totient is φ = 191923200.

The previous prime is 205741013. The next prime is 205741027. The reversal of 205741021 is 120147502.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1651225 + 204089796 = 1285^2 + 14286^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 205741021 - 2³ = 205741013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 205740983 and 205741001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205741027) 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, 51630 + ... + 55471.

It is an arithmetic number, because the mean of its divisors is an integer number (27471663).

Almost surely, 2^205741021 is an apocalyptic number.

It is an amenable number.

205741021 is a deficient number, since it is larger than the sum of its proper divisors (14032283).

205741021 is a wasteful number, since it uses less digits than its factorization.

205741021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107231.

The product of its (nonzero) digits is 560, while the sum is 22.

The square root of 205741021 is about 14343.6752961018. The cubic root of 205741021 is about 590.3464603054.

Adding to 205741021 its reverse (120147502), we get a palindrome (325888523).

The spelling of 205741021 in words is "two hundred five million, seven hundred forty-one thousand, twenty-one".