20002221201121 has 4 divisors (see below), whose sum is σ = 20003802042132. Its totient is φ = 20000640360112.

The previous prime is 20002221201107. The next prime is 20002221201139. The reversal of 20002221201121 is 12110212220002.

It is a happy number.

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 844311050496 + 19157910150625 = 918864^2 + 4376975^2 .

It is a cyclic number.

It is not a de Polignac number, because 20002221201121 - 2⁵ = 20002221201089 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20002221201095 and 20002221201104.

It is not an unprimeable number, because it can be changed into a prime (20002221201161) 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 3 ways as a sum of consecutive naturals, for example, 790401526 + ... + 790426831.

It is an arithmetic number, because the mean of its divisors is an integer number (5000950510533).

Almost surely, 2^{20002221201121} is an apocalyptic number.

It is an amenable number.

20002221201121 is a deficient number, since it is larger than the sum of its proper divisors (1580841011).

20002221201121 is a wasteful number, since it uses less digits than its factorization.

20002221201121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1580841010.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 20002221201121 its reverse (12110212220002), we get a palindrome (32112433421123).

The spelling of 20002221201121 in words is "twenty trillion, two billion, two hundred twenty-one million, two hundred one thousand, one hundred twenty-one".