25422221 has 6 divisors (see below), whose sum is σ = 27943566. Its totient is φ = 23111000.

The previous prime is 25422193. The next prime is 25422233. The reversal of 25422221 is 12222452.

It can be written as a sum of positive squares in only one way, i.e., 16924996 + 8497225 = 4114^2 + 2915^2 .

It is not a de Polignac number, because 25422221 - 2¹⁸ = 25160077 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25422193 and 25422202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25427221) 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 5 ways as a sum of consecutive naturals, for example, 104930 + ... + 105171.

It is an arithmetic number, because the mean of its divisors is an integer number (4657261).

Almost surely, 2^25422221 is an apocalyptic number.

It is an amenable number.

25422221 is a deficient number, since it is larger than the sum of its proper divisors (2521345).

25422221 is a wasteful number, since it uses less digits than its factorization.

25422221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210123 (or 210112 counting only the distinct ones).

The product of its digits is 640, while the sum is 20.

The square root of 25422221 is about 5042.0453191141. The cubic root of 25422221 is about 294.0387017711.

Adding to 25422221 its reverse (12222452), we get a palindrome (37644673).

The spelling of 25422221 in words is "twenty-five million, four hundred twenty-two thousand, two hundred twenty-one".