200021101100021 has 4 divisors (see below), whose sum is σ = 200081366575200. Its totient is φ = 199960835624844.

The previous prime is 200021101100011. The next prime is 200021101100039. The reversal of 200021101100021 is 120001101120002.

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 200021101100021 - 2²⁶ = 200021033991157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 200021101099975 and 200021101100011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (200021101100011) 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, 30132732611 + ... + 30132739248.

It is an arithmetic number, because the mean of its divisors is an integer number (50020341643800).

Almost surely, 2^{200021101100021} is an apocalyptic number.

It is an amenable number.

200021101100021 is a deficient number, since it is larger than the sum of its proper divisors (60265475179).

200021101100021 is an equidigital number, since it uses as much as digits as its factorization.

200021101100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60265475178.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 200021101100021 its reverse (120001101120002), we get a palindrome (320022202220023).

The spelling of 200021101100021 in words is "two hundred trillion, twenty-one billion, one hundred one million, one hundred thousand, twenty-one".