205521212 has 12 divisors (see below), whose sum is σ = 387328536. Its totient is φ = 94855920.

The previous prime is 205521193. The next prime is 205521221. The reversal of 205521212 is 212125502.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1976114 + ... + 1976217.

It is an arithmetic number, because the mean of its divisors is an integer number (32277378).

Almost surely, 2^205521212 is an apocalyptic number.

It is an amenable number.

205521212 is a deficient number, since it is larger than the sum of its proper divisors (181807324).

205521212 is a wasteful number, since it uses less digits than its factorization.

205521212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3952348 (or 3952346 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 205521212 is about 14336.0110212011. The cubic root of 205521212 is about 590.1361478391.

Adding to 205521212 its reverse (212125502), we get a palindrome (417646714).

The spelling of 205521212 in words is "two hundred five million, five hundred twenty-one thousand, two hundred twelve".