25216215 has 16 divisors (see below), whose sum is σ = 40408800. Its totient is φ = 13427712.

The previous prime is 25216201. The next prime is 25216223. The reversal of 25216215 is 51261252.

It is a happy number.

It is not a de Polignac number, because 25216215 - 2⁵ = 25216183 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16191 + ... + 17679.

It is an arithmetic number, because the mean of its divisors is an integer number (2525550).

Almost surely, 2^25216215 is an apocalyptic number.

25216215 is a deficient number, since it is larger than the sum of its proper divisors (15192585).

25216215 is a wasteful number, since it uses less digits than its factorization.

25216215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2626.

The product of its digits is 1200, while the sum is 24.

The square root of 25216215 is about 5021.5749521440. The cubic root of 25216215 is about 293.2423106298.

Adding to 25216215 its reverse (51261252), we get a palindrome (76477467).

The spelling of 25216215 in words is "twenty-five million, two hundred sixteen thousand, two hundred fifteen".