205122103 has 4 divisors (see below), whose sum is σ = 207039240. Its totient is φ = 203204968.

The previous prime is 205122097. The next prime is 205122107. The reversal of 205122103 is 301221502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 301221502 = 2 ⋅150610751.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-205122103 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205122107) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 958408 + ... + 958621.

It is an arithmetic number, because the mean of its divisors is an integer number (51759810).

Almost surely, 2^205122103 is an apocalyptic number.

205122103 is a deficient number, since it is larger than the sum of its proper divisors (1917137).

205122103 is a wasteful number, since it uses less digits than its factorization.

205122103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1917136.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 205122103 is about 14322.0844502468. The cubic root of 205122103 is about 589.7538981259.

Adding to 205122103 its reverse (301221502), we get a palindrome (506343605).

The spelling of 205122103 in words is "two hundred five million, one hundred twenty-two thousand, one hundred three".