5206256021 has 2 divisors, whose sum is σ = 5206256022. Its totient is φ = 5206256020.

The previous prime is 5206256009. The next prime is 5206256141. The reversal of 5206256021 is 1206526025.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3808617796 + 1397638225 = 61714^2 + 37385^2 .

It is a cyclic number.

It is not a de Polignac number, because 5206256021 - 2²² = 5202061717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5206256221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2603128010 + 2603128011.

It is an arithmetic number, because the mean of its divisors is an integer number (2603128011).

Almost surely, 2^5206256021 is an apocalyptic number.

It is an amenable number.

5206256021 is a deficient number, since it is larger than the sum of its proper divisors (1).

5206256021 is an equidigital number, since it uses as much as digits as its factorization.

5206256021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 5206256021 is about 72154.3901713541. The cubic root of 5206256021 is about 1733.1727027633.

The spelling of 5206256021 in words is "five billion, two hundred six million, two hundred fifty-six thousand, twenty-one".