20425130021 has 2 divisors, whose sum is σ = 20425130022. Its totient is φ = 20425130020.

The previous prime is 20425129997. The next prime is 20425130039. The reversal of 20425130021 is 12003152402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15076401796 + 5348728225 = 122786^2 + 73135^2 .

It is a cyclic number.

It is not a de Polignac number, because 20425130021 - 2¹⁸ = 20424867877 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20425129975 and 20425130002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20425130051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10212565010 + 10212565011.

It is an arithmetic number, because the mean of its divisors is an integer number (10212565011).

Almost surely, 2^20425130021 is an apocalyptic number.

It is an amenable number.

20425130021 is a deficient number, since it is larger than the sum of its proper divisors (1).

20425130021 is an equidigital number, since it uses as much as digits as its factorization.

20425130021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 480, while the sum is 20.

Adding to 20425130021 its reverse (12003152402), we get a palindrome (32428282423).

The spelling of 20425130021 in words is "twenty billion, four hundred twenty-five million, one hundred thirty thousand, twenty-one".