5131040021 has 2 divisors, whose sum is σ = 5131040022. Its totient is φ = 5131040020.

The previous prime is 5131039951. The next prime is 5131040053. The reversal of 5131040021 is 1200401315.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5099959396 + 31080625 = 71414^2 + 5575^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5131040021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5133040021) 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 as a sum of consecutive naturals, namely, 2565520010 + 2565520011.

It is an arithmetic number, because the mean of its divisors is an integer number (2565520011).

Almost surely, 2^5131040021 is an apocalyptic number.

It is an amenable number.

5131040021 is a deficient number, since it is larger than the sum of its proper divisors (1).

5131040021 is an equidigital number, since it uses as much as digits as its factorization.

5131040021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 5131040021 is about 71631.2782309516. The cubic root of 5131040021 is about 1724.7856650029.

Adding to 5131040021 its reverse (1200401315), we get a palindrome (6331441336).

The spelling of 5131040021 in words is "five billion, one hundred thirty-one million, forty thousand, twenty-one".