200100000021 has 4 divisors (see below), whose sum is σ = 266800000032. Its totient is φ = 133400000012.

The previous prime is 200100000011. The next prime is 200100000049. The reversal of 200100000021 is 120000001002.

It is a happy number.

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 200100000021 - 2⁹ = 200099999509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 200099999955 and 200100000009.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (200100000011) 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, 33350000001 + ... + 33350000006.

It is an arithmetic number, because the mean of its divisors is an integer number (66700000008).

Almost surely, 2^200100000021 is an apocalyptic number.

It is an amenable number.

200100000021 is a deficient number, since it is larger than the sum of its proper divisors (66700000011).

200100000021 is an equidigital number, since it uses as much as digits as its factorization.

200100000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66700000010.

The product of its (nonzero) digits is 4, while the sum is 6.

Adding to 200100000021 its reverse (120000001002), we get a palindrome (320100001023).

The spelling of 200100000021 in words is "two hundred billion, one hundred million, twenty-one", and thus it is an aban number.