200561021 has 4 divisors (see below), whose sum is σ = 200768544. Its totient is φ = 200353500.

The previous prime is 200560999. The next prime is 200561029. The reversal of 200561021 is 120165002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 200561021 - 2¹⁸ = 200298877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (200561029) 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 in 3 ways as a sum of consecutive naturals, for example, 102305 + ... + 104246.

It is an arithmetic number, because the mean of its divisors is an integer number (50192136).

Almost surely, 2^200561021 is an apocalyptic number.

It is an amenable number.

200561021 is a deficient number, since it is larger than the sum of its proper divisors (207523).

200561021 is an equidigital number, since it uses as much as digits as its factorization.

200561021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207522.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 200561021 is about 14161.9568210046. The cubic root of 200561021 is about 585.3498489349.

The spelling of 200561021 in words is "two hundred million, five hundred sixty-one thousand, twenty-one".