2102523305 has 4 divisors (see below), whose sum is σ = 2523027972. Its totient is φ = 1682018640.

The previous prime is 2102523277. The next prime is 2102523341. The reversal of 2102523305 is 5033252012.

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

It can be written as a sum of positive squares in 2 ways, for example, as 823173481 + 1279349824 = 28691^2 + 35768^2 .

It is a de Polignac number, because none of the positive numbers 2^k-2102523305 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 210252326 + ... + 210252335.

It is an arithmetic number, because the mean of its divisors is an integer number (630756993).

Almost surely, 2^2102523305 is an apocalyptic number.

It is an amenable number.

2102523305 is a deficient number, since it is larger than the sum of its proper divisors (420504667).

2102523305 is an equidigital number, since it uses as much as digits as its factorization.

2102523305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420504666.

The product of its (nonzero) digits is 1800, while the sum is 23.

The square root of 2102523305 is about 45853.2801989127. The cubic root of 2102523305 is about 1281.0918631560.

Adding to 2102523305 its reverse (5033252012), we get a palindrome (7135775317).

The spelling of 2102523305 in words is "two billion, one hundred two million, five hundred twenty-three thousand, three hundred five".