200005621 has 2 divisors, whose sum is σ = 200005622. Its totient is φ = 200005620.

The previous prime is 200005573. The next prime is 200005639. The reversal of 200005621 is 126500002.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 170694225 + 29311396 = 13065^2 + 5414^2 .

It is a cyclic number.

It is not a de Polignac number, because 200005621 - 2²⁵ = 166451189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 200005595 and 200005604.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (200005661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100002810 + 100002811.

It is an arithmetic number, because the mean of its divisors is an integer number (100002811).

Almost surely, 2^200005621 is an apocalyptic number.

It is an amenable number.

200005621 is a deficient number, since it is larger than the sum of its proper divisors (1).

200005621 is an equidigital number, since it uses as much as digits as its factorization.

200005621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 200005621 is about 14142.3343546955. The cubic root of 200005621 is about 584.8090262258.

Adding to 200005621 its reverse (126500002), we get a palindrome (326505623).

The spelling of 200005621 in words is "two hundred million, five thousand, six hundred twenty-one".