25436221 has 2 divisors, whose sum is σ = 25436222. Its totient is φ = 25436220.

The previous prime is 25436189. The next prime is 25436239. The reversal of 25436221 is 12263452.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24651225 + 784996 = 4965^2 + 886^2 .

It is a cyclic number.

It is not a de Polignac number, because 25436221 - 2⁵ = 25436189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25436291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12718110 + 12718111.

It is an arithmetic number, because the mean of its divisors is an integer number (12718111).

Almost surely, 2^25436221 is an apocalyptic number.

It is an amenable number.

25436221 is a deficient number, since it is larger than the sum of its proper divisors (1).

25436221 is an equidigital number, since it uses as much as digits as its factorization.

25436221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2880, while the sum is 25.

The square root of 25436221 is about 5043.4334535116. The cubic root of 25436221 is about 294.0926675044.

Adding to 25436221 its reverse (12263452), we get a palindrome (37699673).

The spelling of 25436221 in words is "twenty-five million, four hundred thirty-six thousand, two hundred twenty-one".