200021123221 has 8 divisors (see below), whose sum is σ = 208765721304. Its totient is φ = 191460622080.

The previous prime is 200021123171. The next prime is 200021123243. The reversal of 200021123221 is 122321120002.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 341732196 + 199679391025 = 18486^2 + 446855^2 .

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 200021123221 - 2¹¹ = 200021121173 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 200021123195 and 200021123204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (200021153221) 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, 46022016 + ... + 46026361.

It is an arithmetic number, because the mean of its divisors is an integer number (26095715163).

Almost surely, 2^200021123221 is an apocalyptic number.

It is an amenable number.

200021123221 is a deficient number, since it is larger than the sum of its proper divisors (8744598083).

200021123221 is an equidigital number, since it uses as much as digits as its factorization.

200021123221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92048471.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 200021123221 its reverse (122321120002), we get a palindrome (322342243223).

The spelling of 200021123221 in words is "two hundred billion, twenty-one million, one hundred twenty-three thousand, two hundred twenty-one".