200221001 has 4 divisors (see below), whose sum is σ = 201496452. Its totient is φ = 198945552.

The previous prime is 200220989. The next prime is 200221009. The reversal of 200221001 is 100122002.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 21864976 + 178356025 = 4676^2 + 13355^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-200221001 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 200221001.

It is not an unprimeable number, because it can be changed into a prime (200221009) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 637490 + ... + 637803.

It is an arithmetic number, because the mean of its divisors is an integer number (50374113).

Almost surely, 2^200221001 is an apocalyptic number.

It is an amenable number.

200221001 is a deficient number, since it is larger than the sum of its proper divisors (1275451).

200221001 is a wasteful number, since it uses less digits than its factorization.

200221001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1275450.

The product of its (nonzero) digits is 8, while the sum is 8.

The square root of 200221001 is about 14149.9470317030. The cubic root of 200221001 is about 585.0188719653.

Adding to 200221001 its reverse (100122002), we get a palindrome (300343003).

The spelling of 200221001 in words is "two hundred million, two hundred twenty-one thousand, one".