102135205 has 4 divisors (see below), whose sum is σ = 122562252. Its totient is φ = 81708160.

The previous prime is 102135193. The next prime is 102135217. The reversal of 102135205 is 502531201.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (102135193) and next prime (102135217).

It can be written as a sum of positive squares in 2 ways, for example, as 37380996 + 64754209 = 6114^2 + 8047^2 .

It is not a de Polignac number, because 102135205 - 2⁹ = 102134693 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10213516 + ... + 10213525.

It is an arithmetic number, because the mean of its divisors is an integer number (30640563).

Almost surely, 2^102135205 is an apocalyptic number.

It is an amenable number.

102135205 is a deficient number, since it is larger than the sum of its proper divisors (20427047).

102135205 is an equidigital number, since it uses as much as digits as its factorization.

102135205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20427046.

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

The square root of 102135205 is about 10106.1963665862. The cubic root of 102135205 is about 467.4392268509.

Adding to 102135205 its reverse (502531201), we get a palindrome (604666406).

The spelling of 102135205 in words is "one hundred two million, one hundred thirty-five thousand, two hundred five".