221010200021 has 16 divisors (see below), whose sum is σ = 247456366080. Its totient is φ = 196008068160.

The previous prime is 221010200009. The next prime is 221010200063. The reversal of 221010200021 is 120002010122.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221010200021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 221010199975 and 221010200011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221010200071) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1916690 + ... + 2028723.

It is an arithmetic number, because the mean of its divisors is an integer number (15466022880).

Almost surely, 2^221010200021 is an apocalyptic number.

It is an amenable number.

221010200021 is a deficient number, since it is larger than the sum of its proper divisors (26446166059).

221010200021 is a wasteful number, since it uses less digits than its factorization.

221010200021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3945596.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 221010200021 its reverse (120002010122), we get a palindrome (341012210143).

The spelling of 221010200021 in words is "two hundred twenty-one billion, ten million, two hundred thousand, twenty-one".