20002002202121 has 6 divisors (see below), whose sum is σ = 20059811097690. Its totient is φ = 19944359424416.

The previous prime is 20002002202109. The next prime is 20002002202129. The reversal of 20002002202121 is 12120220020002.

It can be written as a sum of positive squares in only one way, i.e., 13690451403721 + 6311550798400 = 3700061^2 + 2512280^2 .

It is a de Polignac number, because none of the positive numbers 2^k-20002002202121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20002002202096 and 20002002202105.

It is not an unprimeable number, because it can be changed into a prime (20002002202129) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 82938176 + ... + 83178993.

It is an arithmetic number, because the mean of its divisors is an integer number (3343301849615).

Almost surely, 2^{20002002202121} is an apocalyptic number.

It is an amenable number.

20002002202121 is a deficient number, since it is larger than the sum of its proper divisors (57808895569).

20002002202121 is an frugal number, since it uses more digits than its factorization.

20002002202121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166117863 (or 166117516 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 20002002202121 its reverse (12120220020002), we get a palindrome (32122222222123).

The spelling of 20002002202121 in words is "twenty trillion, two billion, two million, two hundred two thousand, one hundred twenty-one".