82110021021 has 24 divisors (see below), whose sum is σ = 135556574400. Its totient is φ = 46916594496.

The previous prime is 82110021017. The next prime is 82110021047. The reversal of 82110021021 is 12012001128.

It is not a de Polignac number, because 82110021021 - 2² = 82110021017 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 82110020985 and 82110021003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82110021221) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1009746 + ... + 1088028.

It is an arithmetic number, because the mean of its divisors is an integer number (5648190600).

Almost surely, 2^82110021021 is an apocalyptic number.

It is an amenable number.

82110021021 is a deficient number, since it is larger than the sum of its proper divisors (53446553379).

82110021021 is a wasteful number, since it uses less digits than its factorization.

82110021021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94945 (or 94942 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 82110021021 its reverse (12012001128), we get a palindrome (94122022149).

The spelling of 82110021021 in words is "eighty-two billion, one hundred ten million, twenty-one thousand, twenty-one".