200401021 has 2 divisors, whose sum is σ = 200401022. Its totient is φ = 200401020.

The previous prime is 200401013. The next prime is 200401039. The reversal of 200401021 is 120104002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 195692121 + 4708900 = 13989^2 + 2170^2 .

It is a cyclic number.

It is not a de Polignac number, because 200401021 - 2³ = 200401013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 200400989 and 200401007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (200405021) 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, 100200510 + 100200511.

It is an arithmetic number, because the mean of its divisors is an integer number (100200511).

Almost surely, 2^200401021 is an apocalyptic number.

It is an amenable number.

200401021 is a deficient number, since it is larger than the sum of its proper divisors (1).

200401021 is an equidigital number, since it uses as much as digits as its factorization.

200401021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 200401021 is about 14156.3067570606. The cubic root of 200401021 is about 585.1941508644.

Adding to 200401021 its reverse (120104002), we get a palindrome (320505023).

The spelling of 200401021 in words is "two hundred million, four hundred one thousand, twenty-one".