25226021 has 2 divisors, whose sum is σ = 25226022. Its totient is φ = 25226020.

The previous prime is 25226017. The next prime is 25226023. The reversal of 25226021 is 12062252.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21669025 + 3556996 = 4655^2 + 1886^2 .

It is a cyclic number.

It is not a de Polignac number, because 25226021 - 2² = 25226017 is a prime.

Together with 25226023, it forms a pair of twin primes.

It is a Chen prime.

It is a plaindrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 25225984 and 25226002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25226023) by changing a digit.

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 as a sum of consecutive naturals, namely, 12613010 + 12613011.

It is an arithmetic number, because the mean of its divisors is an integer number (12613011).

Almost surely, 2^25226021 is an apocalyptic number.

It is an amenable number.

25226021 is a deficient number, since it is larger than the sum of its proper divisors (1).

25226021 is an equidigital number, since it uses as much as digits as its factorization.

25226021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 25226021 is about 5022.5512441388. The cubic root of 25226021 is about 293.2803174102.

Adding to 25226021 its reverse (12062252), we get a palindrome (37288273).

The spelling of 25226021 in words is "twenty-five million, two hundred twenty-six thousand, twenty-one".