5312540021 has 2 divisors, whose sum is σ = 5312540022. Its totient is φ = 5312540020.

The previous prime is 5312540003. The next prime is 5312540041. The reversal of 5312540021 is 1200452135.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3281685796 + 2030854225 = 57286^2 + 45065^2 .

It is a cyclic number.

It is not a de Polignac number, because 5312540021 - 2²² = 5308345717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5312540041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2656270010 + 2656270011.

It is an arithmetic number, because the mean of its divisors is an integer number (2656270011).

Almost surely, 2^5312540021 is an apocalyptic number.

It is an amenable number.

5312540021 is a deficient number, since it is larger than the sum of its proper divisors (1).

5312540021 is an equidigital number, since it uses as much as digits as its factorization.

5312540021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 5312540021 is about 72887.1732268442. The cubic root of 5312540021 is about 1744.8873933296.

Adding to 5312540021 its reverse (1200452135), we get a palindrome (6512992156).

The spelling of 5312540021 in words is "five billion, three hundred twelve million, five hundred forty thousand, twenty-one".