2505523321 has 12 divisors (see below), whose sum is σ = 2918290788. Its totient is φ = 2144863392.

The previous prime is 2505523309. The next prime is 2505523343. The reversal of 2505523321 is 1233255052.

It can be written as a sum of positive squares in 2 ways, for example, as 1854508096 + 651015225 = 43064^2 + 25515^2 .

It is not a de Polignac number, because 2505523321 - 2¹⁷ = 2505392249 is a prime.

It is a super-2 number, since 2×2505523321² = 12555294224149738082, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2505523321.

It is not an unprimeable number, because it can be changed into a prime (2505563321) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6975 + ... + 71131.

It is an arithmetic number, because the mean of its divisors is an integer number (243190899).

Almost surely, 2^2505523321 is an apocalyptic number.

It is an amenable number.

2505523321 is a deficient number, since it is larger than the sum of its proper divisors (412767467).

2505523321 is an equidigital number, since it uses as much as digits as its factorization.

2505523321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64968 (or 64961 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 28.

The square root of 2505523321 is about 50055.2027365787. The cubic root of 2505523321 is about 1358.2075797751.

Adding to 2505523321 its reverse (1233255052), we get a palindrome (3738778373).

The spelling of 2505523321 in words is "two billion, five hundred five million, five hundred twenty-three thousand, three hundred twenty-one".