25603321 has 2 divisors, whose sum is σ = 25603322. Its totient is φ = 25603320.

The previous prime is 25603307. The next prime is 25603349. The reversal of 25603321 is 12330652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19669225 + 5934096 = 4435^2 + 2436^2 .

It is a cyclic number.

It is not a de Polignac number, because 25603321 - 2⁵ = 25603289 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 25603292 and 25603301.

It is not a weakly prime, because it can be changed into another prime (25603351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12801660 + 12801661.

It is an arithmetic number, because the mean of its divisors is an integer number (12801661).

Almost surely, 2^25603321 is an apocalyptic number.

It is an amenable number.

25603321 is a deficient number, since it is larger than the sum of its proper divisors (1).

25603321 is an equidigital number, since it uses as much as digits as its factorization.

25603321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080, while the sum is 22.

The square root of 25603321 is about 5059.9724307549. The cubic root of 25603321 is about 294.7352637866.

Adding to 25603321 its reverse (12330652), we get a palindrome (37933973).

The spelling of 25603321 in words is "twenty-five million, six hundred three thousand, three hundred twenty-one".