25513421 has 4 divisors (see below), whose sum is σ = 25525500. Its totient is φ = 25501344.

The previous prime is 25513393. The next prime is 25513441. The reversal of 25513421 is 12431552.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 23522500 + 1990921 = 4850^2 + 1411^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25513421 is a prime.

It is a super-2 number, since 2×25513421² = 1301869302246482, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25513441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1946 + ... + 7403.

It is an arithmetic number, because the mean of its divisors is an integer number (6381375).

Almost surely, 2^25513421 is an apocalyptic number.

It is an amenable number.

25513421 is a deficient number, since it is larger than the sum of its proper divisors (12079).

25513421 is an equidigital number, since it uses as much as digits as its factorization.

25513421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12078.

The product of its digits is 1200, while the sum is 23.

The square root of 25513421 is about 5051.0811713929. The cubic root of 25513421 is about 294.3898948773.

Adding to 25513421 its reverse (12431552), we get a palindrome (37944973).

The spelling of 25513421 in words is "twenty-five million, five hundred thirteen thousand, four hundred twenty-one".