200021122102021 has 4 divisors (see below), whose sum is σ = 218204860474944. Its totient is φ = 181837383729100.

The previous prime is 200021122102013. The next prime is 200021122102027. The reversal of 200021122102021 is 120201221120002.

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 not a de Polignac number, because 200021122102021 - 2³ = 200021122102013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 200021122101986 and 200021122102004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (200021122102027) 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, 9091869186445 + ... + 9091869186466.

It is an arithmetic number, because the mean of its divisors is an integer number (54551215118736).

Almost surely, 2^{200021122102021} is an apocalyptic number.

It is an amenable number.

200021122102021 is a deficient number, since it is larger than the sum of its proper divisors (18183738372923).

200021122102021 is a wasteful number, since it uses less digits than its factorization.

200021122102021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18183738372922.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 200021122102021 its reverse (120201221120002), we get a palindrome (320222343222023).

The spelling of 200021122102021 in words is "two hundred trillion, twenty-one billion, one hundred twenty-two million, one hundred two thousand, twenty-one".