25424421 has 8 divisors (see below), whose sum is σ = 36981024. Its totient is φ = 15408720.

The previous prime is 25424419. The next prime is 25424429. The reversal of 25424421 is 12442452.

It is a happy number.

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

It is not a de Polignac number, because 25424421 - 2¹ = 25424419 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25424391 and 25424400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25424429) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 385186 + ... + 385251.

It is an arithmetic number, because the mean of its divisors is an integer number (4622628).

Almost surely, 2^25424421 is an apocalyptic number.

It is an amenable number.

25424421 is a deficient number, since it is larger than the sum of its proper divisors (11556603).

25424421 is a wasteful number, since it uses less digits than its factorization.

25424421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 770451.

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

The square root of 25424421 is about 5042.2634798273. The cubic root of 25424421 is about 294.0471834125.

Adding to 25424421 its reverse (12442452), we get a palindrome (37866873).

The spelling of 25424421 in words is "twenty-five million, four hundred twenty-four thousand, four hundred twenty-one".