22121100205 has 8 divisors (see below), whose sum is σ = 26546119704. Its totient is φ = 17696347200.

The previous prime is 22121100203. The next prime is 22121100217. The reversal of 22121100205 is 50200112122.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 5860514916 + 16260585289 = 76554^2 + 127517^2 .

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

It is not a de Polignac number, because 22121100205 - 2¹ = 22121100203 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22121100203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 279115 + ... + 349495.

It is an arithmetic number, because the mean of its divisors is an integer number (3318264963).

Almost surely, 2^22121100205 is an apocalyptic number.

It is an amenable number.

22121100205 is a deficient number, since it is larger than the sum of its proper divisors (4425019499).

22121100205 is an equidigital number, since it uses as much as digits as its factorization.

22121100205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133247.

The product of its (nonzero) digits is 80, while the sum is 16.

Adding to 22121100205 its reverse (50200112122), we get a palindrome (72321212327).

The spelling of 22121100205 in words is "twenty-two billion, one hundred twenty-one million, one hundred thousand, two hundred five".