25214521 has 4 divisors (see below), whose sum is σ = 25235344. Its totient is φ = 25193700.

The previous prime is 25214507. The next prime is 25214531. The reversal of 25214521 is 12541252.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25214521 - 2⁵ = 25214489 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25214492 and 25214501.

It is not an unprimeable number, because it can be changed into a prime (25214531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8475 + ... + 11056.

It is an arithmetic number, because the mean of its divisors is an integer number (6308836).

Almost surely, 2^25214521 is an apocalyptic number.

It is an amenable number.

25214521 is a deficient number, since it is larger than the sum of its proper divisors (20823).

25214521 is a wasteful number, since it uses less digits than its factorization.

25214521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20822.

The product of its digits is 800, while the sum is 22.

The square root of 25214521 is about 5021.4062771299. The cubic root of 25214521 is about 293.2357439081.

Adding to 25214521 its reverse (12541252), we get a palindrome (37755773).

The spelling of 25214521 in words is "twenty-five million, two hundred fourteen thousand, five hundred twenty-one".