20002221221121 has 12 divisors (see below), whose sum is σ = 28893198857172. Its totient is φ = 13334305745376.

The previous prime is 20002221221077. The next prime is 20002221221123. The reversal of 20002221221121 is 12112212220002.

It is a happy number.

20002221221121 is a `hidden beast` number, since 200 + 0 + 2 + 221 + 221 + 1 + 21 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 796475927025 + 19205745294096 = 892455^2 + 4382436^2 .

It is not a de Polignac number, because 20002221221121 - 2¹¹ = 20002221219073 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20002221221094 and 20002221221103.

It is not an unprimeable number, because it can be changed into a prime (20002221221123) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42117586 + ... + 42589851.

It is an arithmetic number, because the mean of its divisors is an integer number (2407766571431).

Almost surely, 2^{20002221221121} is an apocalyptic number.

It is an amenable number.

20002221221121 is a deficient number, since it is larger than the sum of its proper divisors (8890977636051).

20002221221121 is a wasteful number, since it uses less digits than its factorization.

20002221221121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84733680 (or 84733677 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 20002221221121 its reverse (12112212220002), we get a palindrome (32114433441123).

The spelling of 20002221221121 in words is "twenty trillion, two billion, two hundred twenty-one million, two hundred twenty-one thousand, one hundred twenty-one".