12685021215 has 16 divisors (see below), whose sum is σ = 20340071136. Its totient is φ = 6750665600.

The previous prime is 12685021211. The next prime is 12685021247. The reversal of 12685021215 is 51212058621.

It is not a de Polignac number, because 12685021215 - 2² = 12685021211 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12685021211) 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, 910296 + ... + 924125.

It is an arithmetic number, because the mean of its divisors is an integer number (1271254446).

Almost surely, 2^12685021215 is an apocalyptic number.

12685021215 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12685021215 is a deficient number, since it is larger than the sum of its proper divisors (7655049921).

12685021215 is a wasteful number, since it uses less digits than its factorization.

12685021215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1834890.

The product of its (nonzero) digits is 9600, while the sum is 33.

Adding to 12685021215 its reverse (51212058621), we get a palindrome (63897079836).

The spelling of 12685021215 in words is "twelve billion, six hundred eighty-five million, twenty-one thousand, two hundred fifteen".