205121010 has 16 divisors (see below), whose sum is σ = 492290496. Its totient is φ = 54698928.

The previous prime is 205121009. The next prime is 205121023. The reversal of 205121010 is 10121502.

205121010 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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, 3418654 + ... + 3418713.

It is an arithmetic number, because the mean of its divisors is an integer number (30768156).

Almost surely, 2^205121010 is an apocalyptic number.

205121010 is an abundant number, since it is smaller than the sum of its proper divisors (287169486).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

205121010 is a wasteful number, since it uses less digits than its factorization.

205121010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6837377.

The product of its (nonzero) digits is 20, while the sum is 12.

The square root of 205121010 is about 14322.0462923424. The cubic root of 205121010 is about 589.7528506162.

Adding to 205121010 its reverse (10121502), we get a palindrome (215242512).

The spelling of 205121010 in words is "two hundred five million, one hundred twenty-one thousand, ten".