205021252315 has 24 divisors (see below), whose sum is σ = 270478275984. Its totient is φ = 149076840000.

The previous prime is 205021252301. The next prime is 205021252361. The reversal of 205021252315 is 513252120502.

It is not a de Polignac number, because 205021252315 - 2¹⁷ = 205021121243 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3297304 + ... + 3358906.

It is an arithmetic number, because the mean of its divisors is an integer number (11269928166).

Almost surely, 2^205021252315 is an apocalyptic number.

205021252315 is a deficient number, since it is larger than the sum of its proper divisors (65457023669).

205021252315 is a wasteful number, since it uses less digits than its factorization.

205021252315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67131 (or 67120 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 28.

Adding to 205021252315 its reverse (513252120502), we get a palindrome (718273372817).

The spelling of 205021252315 in words is "two hundred five billion, twenty-one million, two hundred fifty-two thousand, three hundred fifteen".