25632221 has 2 divisors, whose sum is σ = 25632222. Its totient is φ = 25632220.

The previous prime is 25632193. The next prime is 25632227. The reversal of 25632221 is 12223652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21576025 + 4056196 = 4645^2 + 2014^2 .

It is a cyclic number.

It is not a de Polignac number, because 25632221 - 2¹⁰ = 25631197 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25632227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12816110 + 12816111.

It is an arithmetic number, because the mean of its divisors is an integer number (12816111).

Almost surely, 2^25632221 is an apocalyptic number.

It is an amenable number.

25632221 is a deficient number, since it is larger than the sum of its proper divisors (1).

25632221 is an equidigital number, since it uses as much as digits as its factorization.

25632221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1440, while the sum is 23.

The square root of 25632221 is about 5062.8273721311. The cubic root of 25632221 is about 294.8461171959.

Adding to 25632221 its reverse (12223652), we get a palindrome (37855873).

The spelling of 25632221 in words is "twenty-five million, six hundred thirty-two thousand, two hundred twenty-one".