12821085 has 20 divisors (see below), whose sum is σ = 22983708. Its totient is φ = 6837696.

The previous prime is 12821059. The next prime is 12821087. The reversal of 12821085 is 58012821.

12821085 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 5433561 + 7387524 = 2331^2 + 2718^2 .

It is not a de Polignac number, because 12821085 - 2⁶ = 12821021 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12821087) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 15424 + ... + 16233.

Almost surely, 2^12821085 is an apocalyptic number.

12821085 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12821085 is a deficient number, since it is larger than the sum of its proper divisors (10162623).

12821085 is an equidigital number, since it uses as much as digits as its factorization.

12821085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31674 (or 31665 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 27.

The square root of 12821085 is about 3580.6542698228. The cubic root of 12821085 is about 234.0497921655.

The spelling of 12821085 in words is "twelve million, eight hundred twenty-one thousand, eighty-five".