82601021 has 2 divisors, whose sum is σ = 82601022. Its totient is φ = 82601020.

The previous prime is 82601009. The next prime is 82601047. The reversal of 82601021 is 12010628.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74822500 + 7778521 = 8650^2 + 2789^2 .

It is a cyclic number.

It is not a de Polignac number, because 82601021 - 2¹⁰ = 82599997 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 82600984 and 82601002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82601221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41300510 + 41300511.

It is an arithmetic number, because the mean of its divisors is an integer number (41300511).

Almost surely, 2^82601021 is an apocalyptic number.

It is an amenable number.

82601021 is a deficient number, since it is larger than the sum of its proper divisors (1).

82601021 is an equidigital number, since it uses as much as digits as its factorization.

82601021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 82601021 is about 9088.5103839958. The cubic root of 82601021 is about 435.5069985865.

Adding to 82601021 its reverse (12010628), we get a palindrome (94611649).

The spelling of 82601021 in words is "eighty-two million, six hundred one thousand, twenty-one".