200121401 has 2 divisors, whose sum is σ = 200121402. Its totient is φ = 200121400.

The previous prime is 200121391. The next prime is 200121403. The reversal of 200121401 is 104121002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 178489600 + 21631801 = 13360^2 + 4651^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-200121401 is a prime.

Together with 200121403, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (200121403) 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, 100060700 + 100060701.

It is an arithmetic number, because the mean of its divisors is an integer number (100060701).

Almost surely, 2^200121401 is an apocalyptic number.

It is an amenable number.

200121401 is a deficient number, since it is larger than the sum of its proper divisors (1).

200121401 is an equidigital number, since it uses as much as digits as its factorization.

200121401 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 11.

The square root of 200121401 is about 14146.4271461030. The cubic root of 200121401 is about 584.9218499349.

Adding to 200121401 its reverse (104121002), we get a palindrome (304242403).

The spelling of 200121401 in words is "two hundred million, one hundred twenty-one thousand, four hundred one".