25213503204521 has 4 divisors (see below), whose sum is σ = 25689229680132. Its totient is φ = 24737776728912.

The previous prime is 25213503204509. The next prime is 25213503204523. The reversal of 25213503204521 is 12540230531252.

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 14398685593600 + 10814817610921 = 3794560^2 + 3288589^2 .

It is a cyclic number.

It is not a de Polignac number, because 25213503204521 - 2¹⁸ = 25213502942377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25213503204523) 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, 237863237726 + ... + 237863237831.

It is an arithmetic number, because the mean of its divisors is an integer number (6422307420033).

Almost surely, 2^{25213503204521} is an apocalyptic number.

It is an amenable number.

25213503204521 is a deficient number, since it is larger than the sum of its proper divisors (475726475611).

25213503204521 is an equidigital number, since it uses as much as digits as its factorization.

25213503204521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 475726475610.

The product of its (nonzero) digits is 72000, while the sum is 35.

Adding to 25213503204521 its reverse (12540230531252), we get a palindrome (37753733735773).

The spelling of 25213503204521 in words is "twenty-five trillion, two hundred thirteen billion, five hundred three million, two hundred four thousand, five hundred twenty-one".