201200821 has 2 divisors, whose sum is σ = 201200822. Its totient is φ = 201200820.

The previous prime is 201200801. The next prime is 201200837. The reversal of 201200821 is 128002102.

It is an a-pointer prime, because the next prime (201200837) can be obtained adding 201200821 to its sum of digits (16).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 164839921 + 36360900 = 12839^2 + 6030^2 .

It is a cyclic number.

It is not a de Polignac number, because 201200821 - 2⁹ = 201200309 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 201200795 and 201200804.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201200801) 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, 100600410 + 100600411.

It is an arithmetic number, because the mean of its divisors is an integer number (100600411).

Almost surely, 2^201200821 is an apocalyptic number.

It is an amenable number.

201200821 is a deficient number, since it is larger than the sum of its proper divisors (1).

201200821 is an equidigital number, since it uses as much as digits as its factorization.

201200821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 201200821 is about 14184.5275212113. The cubic root of 201200821 is about 585.9716203102.

Adding to 201200821 its reverse (128002102), we get a palindrome (329202923).

The spelling of 201200821 in words is "two hundred one million, two hundred thousand, eight hundred twenty-one".