82900257021 has 12 divisors (see below), whose sum is σ = 119803169148. Its totient is φ = 55239905664.

The previous prime is 82900257017. The next prime is 82900257043. The reversal of 82900257021 is 12075200928.

82900257021 is a `hidden beast` number, since 82 + 9 + 0 + 0 + 2 + 570 + 2 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 66920516100 + 15979740921 = 258690^2 + 126411^2 .

It is not a de Polignac number, because 82900257021 - 2² = 82900257017 is a prime.

It is a super-2 number, since 2×82900257021² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82900257061) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2224860 + ... + 2261813.

It is an arithmetic number, because the mean of its divisors is an integer number (9983597429).

Almost surely, 2^82900257021 is an apocalyptic number.

It is an amenable number.

82900257021 is a deficient number, since it is larger than the sum of its proper divisors (36902912127).

82900257021 is a wasteful number, since it uses less digits than its factorization.

82900257021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4488732 (or 4488729 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

Adding to 82900257021 its reverse (12075200928), we get a palindrome (94975457949).

The spelling of 82900257021 in words is "eighty-two billion, nine hundred million, two hundred fifty-seven thousand, twenty-one".