200021101 has 4 divisors (see below), whose sum is σ = 228595552. Its totient is φ = 171446652.

The previous prime is 200021071. The next prime is 200021117. The reversal of 200021101 is 101120002.

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, and also an emirpimes, since its reverse is a distinct semiprime: 101120002 = 2 ⋅50560001.

It is a cyclic number.

It is not a de Polignac number, because 200021101 - 2⁷ = 200020973 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (7), and also a Moran number because the ratio is a prime number: 28574443 = 200021101 / (2 + 0 + 0 + 0 + 2 + 1 + 1 + 0 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (200021401) 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, 14287215 + ... + 14287228.

It is an arithmetic number, because the mean of its divisors is an integer number (57148888).

Almost surely, 2^200021101 is an apocalyptic number.

It is an amenable number.

200021101 is a deficient number, since it is larger than the sum of its proper divisors (28574451).

200021101 is an equidigital number, since it uses as much as digits as its factorization.

200021101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28574450.

The product of its (nonzero) digits is 4, while the sum is 7.

The square root of 200021101 is about 14142.8816370639. The cubic root of 200021101 is about 584.8241134854.

Adding to 200021101 its reverse (101120002), we get a palindrome (301141103).

The spelling of 200021101 in words is "two hundred million, twenty-one thousand, one hundred one".