2204312521 has 4 divisors (see below), whose sum is σ = 2204705412. Its totient is φ = 2203919632.

The previous prime is 2204312519. The next prime is 2204312563. The reversal of 2204312521 is 1252134022.

It is a happy number.

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 1137375625 + 1066936896 = 33725^2 + 32664^2 .

It is a cyclic number.

It is not a de Polignac number, because 2204312521 - 2¹ = 2204312519 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2204312492 and 2204312501.

It is not an unprimeable number, because it can be changed into a prime (2204312581) 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, 187906 + ... + 199291.

It is an arithmetic number, because the mean of its divisors is an integer number (551176353).

Almost surely, 2^2204312521 is an apocalyptic number.

It is an amenable number.

2204312521 is a deficient number, since it is larger than the sum of its proper divisors (392891).

2204312521 is an equidigital number, since it uses as much as digits as its factorization.

2204312521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 392890.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 2204312521 is about 46950.1067197935. The cubic root of 2204312521 is about 1301.4407145841.

Adding to 2204312521 its reverse (1252134022), we get a palindrome (3456446543).

The spelling of 2204312521 in words is "two billion, two hundred four million, three hundred twelve thousand, five hundred twenty-one".