205121030 has 16 divisors (see below), whose sum is σ = 369420480. Its totient is φ = 82003392.

The previous prime is 205121023. The next prime is 205121039. The reversal of 205121030 is 30121502.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 205120996 and 205121014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205121039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18386 + ... + 27354.

It is an arithmetic number, because the mean of its divisors is an integer number (23088780).

Almost surely, 2^205121030 is an apocalyptic number.

205121030 is a deficient number, since it is larger than the sum of its proper divisors (164299450).

205121030 is a wasteful number, since it uses less digits than its factorization.

205121030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11263.

The product of its (nonzero) digits is 60, while the sum is 14.

The square root of 205121030 is about 14322.0469905667. The cubic root of 205121030 is about 589.7528697839.

Adding to 205121030 its reverse (30121502), we get a palindrome (235242532).

The spelling of 205121030 in words is "two hundred five million, one hundred twenty-one thousand, thirty".