25105421 has 8 divisors (see below), whose sum is σ = 28025184. Its totient is φ = 22291920.

The previous prime is 25105391. The next prime is 25105429. The reversal of 25105421 is 12450152.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 25105421 - 2¹⁰ = 25104397 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25105393 and 25105402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25105429) 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 7 ways as a sum of consecutive naturals, for example, 26066 + ... + 27011.

It is an arithmetic number, because the mean of its divisors is an integer number (3503148).

Almost surely, 2^25105421 is an apocalyptic number.

It is an amenable number.

25105421 is a deficient number, since it is larger than the sum of its proper divisors (2919763).

25105421 is a wasteful number, since it uses less digits than its factorization.

25105421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53131.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 25105421 is about 5010.5310097833. The cubic root of 25105421 is about 292.8122012904.

Adding to 25105421 its reverse (12450152), we get a palindrome (37555573).

The spelling of 25105421 in words is "twenty-five million, one hundred five thousand, four hundred twenty-one".