20002201020121 has 4 divisors (see below), whose sum is σ = 20002210038244. Its totient is φ = 20002192002000.

The previous prime is 20002201020037. The next prime is 20002201020181. The reversal of 20002201020121 is 12102010220002.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 14072664336025 + 5929536684096 = 3751355^2 + 2435064^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20002201020121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20002201020181) 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, 1393591 + ... + 6476611.

It is an arithmetic number, because the mean of its divisors is an integer number (5000552509561).

Almost surely, 2^{20002201020121} is an apocalyptic number.

It is an amenable number.

20002201020121 is a deficient number, since it is larger than the sum of its proper divisors (9018123).

20002201020121 is an equidigital number, since it uses as much as digits as its factorization.

20002201020121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9018122.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 20002201020121 its reverse (12102010220002), we get a palindrome (32104211240123).

The spelling of 20002201020121 in words is "twenty trillion, two billion, two hundred one million, twenty thousand, one hundred twenty-one".