82202521 has 2 divisors, whose sum is σ = 82202522. Its totient is φ = 82202520.

The previous prime is 82202513. The next prime is 82202539. The reversal of 82202521 is 12520228.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78057225 + 4145296 = 8835^2 + 2036^2 .

It is a cyclic number.

It is not a de Polignac number, because 82202521 - 2³ = 82202513 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 82202492 and 82202501.

It is not a weakly prime, because it can be changed into another prime (82202591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41101260 + 41101261.

It is an arithmetic number, because the mean of its divisors is an integer number (41101261).

Almost surely, 2^82202521 is an apocalyptic number.

It is an amenable number.

82202521 is a deficient number, since it is larger than the sum of its proper divisors (1).

82202521 is an equidigital number, since it uses as much as digits as its factorization.

82202521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 82202521 is about 9066.5605937423. The cubic root of 82202521 is about 434.8055166201.

Adding to 82202521 its reverse (12520228), we get a palindrome (94722749).

The spelling of 82202521 in words is "eighty-two million, two hundred two thousand, five hundred twenty-one".