200025821 has 2 divisors, whose sum is σ = 200025822. Its totient is φ = 200025820.

The previous prime is 200025799. The next prime is 200025823. The reversal of 200025821 is 128520002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 116942596 + 83083225 = 10814^2 + 9115^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-200025821 is a prime.

Together with 200025823, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 200025793 and 200025802.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (200025823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100012910 + 100012911.

It is an arithmetic number, because the mean of its divisors is an integer number (100012911).

Almost surely, 2^200025821 is an apocalyptic number.

It is an amenable number.

200025821 is a deficient number, since it is larger than the sum of its proper divisors (1).

200025821 is an equidigital number, since it uses as much as digits as its factorization.

200025821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 200025821 is about 14143.0485044774. The cubic root of 200025821 is about 584.8287135803.

Adding to 200025821 its reverse (128520002), we get a palindrome (328545823).

The spelling of 200025821 in words is "two hundred million, twenty-five thousand, eight hundred twenty-one".