25115421 has 8 divisors (see below), whose sum is σ = 34642080. Its totient is φ = 16166192.

The previous prime is 25115399. The next prime is 25115423. The reversal of 25115421 is 12451152.

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 25115421 - 2⁶ = 25115357 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25115423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 144255 + ... + 144428.

It is an arithmetic number, because the mean of its divisors is an integer number (4330260).

Almost surely, 2^25115421 is an apocalyptic number.

It is an amenable number.

25115421 is a deficient number, since it is larger than the sum of its proper divisors (9526659).

25115421 is a wasteful number, since it uses less digits than its factorization.

25115421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288715.

The product of its digits is 400, while the sum is 21.

The square root of 25115421 is about 5011.5288086571. The cubic root of 25115421 is about 292.8510738155.

Adding to 25115421 its reverse (12451152), we get a palindrome (37566573).

The spelling of 25115421 in words is "twenty-five million, one hundred fifteen thousand, four hundred twenty-one".