20002131302121 has 6 divisors (see below), whose sum is σ = 28891967436410. Its totient is φ = 13334754201408.

The previous prime is 20002131302119. The next prime is 20002131302143. The reversal of 20002131302121 is 12120313120002.

20002131302121 is a `hidden beast` number, since 200 + 0 + 213 + 130 + 2 + 121 = 666.

It can be written as a sum of positive squares in only one way, i.e., 12422769914025 + 7579361388096 = 3524595^2 + 2753064^2 .

It is not a de Polignac number, because 20002131302121 - 2¹ = 20002131302119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20002131302094 and 20002131302103.

It is not an unprimeable number, because it can be changed into a prime (20002131202121) 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, 1111229516776 + ... + 1111229516793.

Almost surely, 2^{20002131302121} is an apocalyptic number.

It is an amenable number.

20002131302121 is a deficient number, since it is larger than the sum of its proper divisors (8889836134289).

20002131302121 is a wasteful number, since it uses less digits than its factorization.

20002131302121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2222459033575 (or 2222459033572 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 20002131302121 its reverse (12120313120002), we get a palindrome (32122444422123).

The spelling of 20002131302121 in words is "twenty trillion, two billion, one hundred thirty-one million, three hundred two thousand, one hundred twenty-one".