200221220200021 has 4 divisors (see below), whose sum is σ = 200286630598444. Its totient is φ = 200155809801600.

The previous prime is 200221220200019. The next prime is 200221220200051. The reversal of 200221220200021 is 120002022122002.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 186702545799396 + 13518674400625 = 13663914^2 + 3676775^2 .

It is a cyclic number.

It is not a de Polignac number, because 200221220200021 - 2¹ = 200221220200019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 200221220199968 and 200221220200004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (200221220200051) 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, 32705194620 + ... + 32705200741.

It is an arithmetic number, because the mean of its divisors is an integer number (50071657649611).

Almost surely, 2^{200221220200021} is an apocalyptic number.

It is an amenable number.

200221220200021 is a deficient number, since it is larger than the sum of its proper divisors (65410398423).

200221220200021 is an equidigital number, since it uses as much as digits as its factorization.

200221220200021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65410398422.

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 200221220200021 its reverse (120002022122002), we get a palindrome (320223242322023).

The spelling of 200221220200021 in words is "two hundred trillion, two hundred twenty-one billion, two hundred twenty million, two hundred thousand, twenty-one".