204421442220101 has 4 divisors (see below), whose sum is σ = 211470457469100. Its totient is φ = 197372426971104.

The previous prime is 204421442220097. The next prime is 204421442220109. The reversal of 204421442220101 is 101022244124402.

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 85421052007201 + 119000390212900 = 9242351^2 + 10908730^2 .

It is a cyclic number.

It is not a de Polignac number, because 204421442220101 - 2² = 204421442220097 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29), and also a Moran number because the ratio is a prime number: 7049015248969 = 204421442220101 / (2 + 0 + 4 + 4 + 2 + 1 + 4 + 4 + 2 + 2 + 2 + 0 + 1 + 0 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204421442220109) 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, 3524507624456 + ... + 3524507624513.

It is an arithmetic number, because the mean of its divisors is an integer number (52867614367275).

Almost surely, 2^{204421442220101} is an apocalyptic number.

It is an amenable number.

204421442220101 is a deficient number, since it is larger than the sum of its proper divisors (7049015248999).

204421442220101 is an equidigital number, since it uses as much as digits as its factorization.

204421442220101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7049015248998.

The product of its (nonzero) digits is 8192, while the sum is 29.

Adding to 204421442220101 its reverse (101022244124402), we get a palindrome (305443686344503).

The spelling of 204421442220101 in words is "two hundred four trillion, four hundred twenty-one billion, four hundred forty-two million, two hundred twenty thousand, one hundred one".