25244421 has 4 divisors (see below), whose sum is σ = 33659232. Its totient is φ = 16829612.

The previous prime is 25244419. The next prime is 25244431. The reversal of 25244421 is 12444252.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25244421 - 2¹ = 25244419 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 25244391 and 25244400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25244411) 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, 4207401 + ... + 4207406.

It is an arithmetic number, because the mean of its divisors is an integer number (8414808).

Almost surely, 2^25244421 is an apocalyptic number.

It is an amenable number.

25244421 is a deficient number, since it is larger than the sum of its proper divisors (8414811).

25244421 is an equidigital number, since it uses as much as digits as its factorization.

25244421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8414810.

The product of its digits is 2560, while the sum is 24.

The square root of 25244421 is about 5024.3826486445. The cubic root of 25244421 is about 293.3516068449.

Adding to 25244421 its reverse (12444252), we get a palindrome (37688673).

The spelling of 25244421 in words is "twenty-five million, two hundred forty-four thousand, four hundred twenty-one".