25208421 has 16 divisors (see below), whose sum is σ = 40435200. Its totient is φ = 13646448.

The previous prime is 25208401. The next prime is 25208441. The reversal of 25208421 is 12480252.

It is an interprime number because it is at equal distance from previous prime (25208401) and next prime (25208441).

It is not a de Polignac number, because 25208421 - 2⁵ = 25208389 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25208391 and 25208400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25208401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31191 + ... + 31988.

It is an arithmetic number, because the mean of its divisors is an integer number (2527200).

Almost surely, 2^25208421 is an apocalyptic number.

25208421 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

25208421 is a deficient number, since it is larger than the sum of its proper divisors (15226779).

25208421 is a wasteful number, since it uses less digits than its factorization.

25208421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63208.

The product of its (nonzero) digits is 1280, while the sum is 24.

The square root of 25208421 is about 5020.7988408220. The cubic root of 25208421 is about 293.2120950710.

Adding to 25208421 its reverse (12480252), we get a palindrome (37688673).

The spelling of 25208421 in words is "twenty-five million, two hundred eight thousand, four hundred twenty-one".