25682221 has 4 divisors (see below), whose sum is σ = 25706812. Its totient is φ = 25657632.

The previous prime is 25682219. The next prime is 25682227. The reversal of 25682221 is 12228652.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 23474025 + 2208196 = 4845^2 + 1486^2 .

It is a cyclic number.

It is not a de Polignac number, because 25682221 - 2¹ = 25682219 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25682221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25682227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10656 + ... + 12841.

It is an arithmetic number, because the mean of its divisors is an integer number (6426703).

Almost surely, 2^25682221 is an apocalyptic number.

It is an amenable number.

25682221 is a deficient number, since it is larger than the sum of its proper divisors (24591).

25682221 is a wasteful number, since it uses less digits than its factorization.

25682221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24590.

The product of its digits is 3840, while the sum is 28.

The square root of 25682221 is about 5067.7629186851. The cubic root of 25682221 is about 295.0377084805.

The spelling of 25682221 in words is "twenty-five million, six hundred eighty-two thousand, two hundred twenty-one".