202200100021 has 4 divisors (see below), whose sum is σ = 202611913344. Its totient is φ = 201788286700.

The previous prime is 202200100009. The next prime is 202200100097. The reversal of 202200100021 is 120001002202.

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: 120001002202 = 2 ⋅60000501101.

It is a cyclic number.

It is not a de Polignac number, because 202200100021 - 2¹¹ = 202200097973 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 202200099980 and 202200100007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202200130021) 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, 205905925 + ... + 205906906.

It is an arithmetic number, because the mean of its divisors is an integer number (50652978336).

Almost surely, 2^202200100021 is an apocalyptic number.

It is an amenable number.

202200100021 is a deficient number, since it is larger than the sum of its proper divisors (411813323).

202200100021 is an equidigital number, since it uses as much as digits as its factorization.

202200100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 411813322.

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 202200100021 its reverse (120001002202), we get a palindrome (322201102223).

The spelling of 202200100021 in words is "two hundred two billion, two hundred million, one hundred thousand, twenty-one".