25015421 has 16 divisors (see below), whose sum is σ = 27108864. Its totient is φ = 23025024.

The previous prime is 25015411. The next prime is 25015433. The reversal of 25015421 is 12451052.

It is not a de Polignac number, because 25015421 - 2¹⁸ = 24753277 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25015393 and 25015402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25015411) 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 15 ways as a sum of consecutive naturals, for example, 78755 + ... + 79071.

It is an arithmetic number, because the mean of its divisors is an integer number (1694304).

Almost surely, 2^25015421 is an apocalyptic number.

It is an amenable number.

25015421 is a deficient number, since it is larger than the sum of its proper divisors (2093443).

25015421 is a wasteful number, since it uses less digits than its factorization.

25015421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 460.

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

The square root of 25015421 is about 5001.5418622661. The cubic root of 25015421 is about 292.4618831671.

Adding to 25015421 its reverse (12451052), we get a palindrome (37466473).

The spelling of 25015421 in words is "twenty-five million, fifteen thousand, four hundred twenty-one".