200421017 has 2 divisors, whose sum is σ = 200421018. Its totient is φ = 200421016.

The previous prime is 200420993. The next prime is 200421047. The reversal of 200421017 is 710124002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 132342016 + 68079001 = 11504^2 + 8251^2 .

It is a cyclic number.

It is not a de Polignac number, because 200421017 - 2²² = 196226713 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 200420986 and 200421004.

It is not a weakly prime, because it can be changed into another prime (200421047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100210508 + 100210509.

It is an arithmetic number, because the mean of its divisors is an integer number (100210509).

Almost surely, 2^200421017 is an apocalyptic number.

It is an amenable number.

200421017 is a deficient number, since it is larger than the sum of its proper divisors (1).

200421017 is an equidigital number, since it uses as much as digits as its factorization.

200421017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112, while the sum is 17.

The square root of 200421017 is about 14157.0129970979. The cubic root of 200421017 is about 585.2136137611.

Adding to 200421017 its reverse (710124002), we get a palindrome (910545019).

The spelling of 200421017 in words is "two hundred million, four hundred twenty-one thousand, seventeen".