200421797 has 2 divisors, whose sum is σ = 200421798. Its totient is φ = 200421796.

The previous prime is 200421791. The next prime is 200421803. The reversal of 200421797 is 797124002.

It is a balanced prime because it is at equal distance from previous prime (200421791) and next prime (200421803).

It can be written as a sum of positive squares in only one way, i.e., 200109316 + 312481 = 14146^2 + 559^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-200421797 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (200421791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100210898 + 100210899.

It is an arithmetic number, because the mean of its divisors is an integer number (100210899).

Almost surely, 2^200421797 is an apocalyptic number.

It is an amenable number.

200421797 is a deficient number, since it is larger than the sum of its proper divisors (1).

200421797 is an equidigital number, since it uses as much as digits as its factorization.

200421797 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7056, while the sum is 32.

The square root of 200421797 is about 14157.0405452552. The cubic root of 200421797 is about 585.2143729396.

Adding to 200421797 its reverse (797124002), we get a palindrome (997545799).

The spelling of 200421797 in words is "two hundred million, four hundred twenty-one thousand, seven hundred ninety-seven".