221000200021 has 8 divisors (see below), whose sum is σ = 226401235200. Its totient is φ = 215599678560.

The previous prime is 221000200013. The next prime is 221000200049. The reversal of 221000200021 is 120002000122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221000200021 - 2³ = 221000200013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221000199980 and 221000200007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221000200051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 828540 + ... + 1062298.

It is an arithmetic number, because the mean of its divisors is an integer number (28300154400).

Almost surely, 2^221000200021 is an apocalyptic number.

It is an amenable number.

221000200021 is a deficient number, since it is larger than the sum of its proper divisors (5401035179).

221000200021 is a wasteful number, since it uses less digits than its factorization.

221000200021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256859.

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

Adding to 221000200021 its reverse (120002000122), we get a palindrome (341002200143).

The spelling of 221000200021 in words is "two hundred twenty-one billion, two hundred thousand, twenty-one".