205121012 has 24 divisors (see below), whose sum is σ = 362299392. Its totient is φ = 101612000.

The previous prime is 205121009. The next prime is 205121023. The reversal of 205121012 is 210121502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 292262 + ... + 292962.

It is an arithmetic number, because the mean of its divisors is an integer number (15095808).

Almost surely, 2^205121012 is an apocalyptic number.

It is an amenable number.

205121012 is a deficient number, since it is larger than the sum of its proper divisors (157178380).

205121012 is a wasteful number, since it uses less digits than its factorization.

205121012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1279 (or 1277 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 14.

The square root of 205121012 is about 14322.0463621649. The cubic root of 205121012 is about 589.7528525330.

Adding to 205121012 its reverse (210121502), we get a palindrome (415242514).

The spelling of 205121012 in words is "two hundred five million, one hundred twenty-one thousand, twelve".