12821505 has 16 divisors (see below), whose sum is σ = 20560704. Its totient is φ = 6822720.

The previous prime is 12821503. The next prime is 12821521. The reversal of 12821505 is 50512821.

It is not a de Polignac number, because 12821505 - 2¹ = 12821503 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12821503) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9747 + ... + 10983.

It is an arithmetic number, because the mean of its divisors is an integer number (1285044).

Almost surely, 2^12821505 is an apocalyptic number.

12821505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12821505 is a deficient number, since it is larger than the sum of its proper divisors (7739199).

12821505 is a wasteful number, since it uses less digits than its factorization.

12821505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1936.

The product of its (nonzero) digits is 800, while the sum is 24.

The square root of 12821505 is about 3580.7129178419. The cubic root of 12821505 is about 234.0523478472.

The spelling of 12821505 in words is "twelve million, eight hundred twenty-one thousand, five hundred five".