25052821 has 2 divisors, whose sum is σ = 25052822. Its totient is φ = 25052820.

The previous prime is 25052813. The next prime is 25052831. The reversal of 25052821 is 12825052.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21762225 + 3290596 = 4665^2 + 1814^2 .

It is a cyclic number.

It is not a de Polignac number, because 25052821 - 2³ = 25052813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25052801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12526410 + 12526411.

It is an arithmetic number, because the mean of its divisors is an integer number (12526411).

Almost surely, 2^25052821 is an apocalyptic number.

It is an amenable number.

25052821 is a deficient number, since it is larger than the sum of its proper divisors (1).

25052821 is an equidigital number, since it uses as much as digits as its factorization.

25052821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1600, while the sum is 25.

The square root of 25052821 is about 5005.2793128855. The cubic root of 25052821 is about 292.6075616783.

Adding to 25052821 its reverse (12825052), we get a palindrome (37877873).

The spelling of 25052821 in words is "twenty-five million, fifty-two thousand, eight hundred twenty-one".