205021315 has 16 divisors (see below), whose sum is σ = 248330016. Its totient is φ = 162489600.

The previous prime is 205021301. The next prime is 205021337. The reversal of 205021315 is 513120502.

It is a de Polignac number, because none of the positive numbers 2^k-205021315 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 205021292 and 205021301.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 393255 + ... + 393775.

It is an arithmetic number, because the mean of its divisors is an integer number (15520626).

Almost surely, 2^205021315 is an apocalyptic number.

205021315 is a deficient number, since it is larger than the sum of its proper divisors (43308701).

205021315 is a wasteful number, since it uses less digits than its factorization.

205021315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1110.

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 205021315 is about 14318.5653960165. The cubic root of 205021315 is about 589.6572892393.

Adding to 205021315 its reverse (513120502), we get a palindrome (718141817).

The spelling of 205021315 in words is "two hundred five million, twenty-one thousand, three hundred fifteen".