12138204705 has 32 divisors (see below), whose sum is σ = 21353545728. Its totient is φ = 5838840000.

The previous prime is 12138204703. The next prime is 12138204761. The reversal of 12138204705 is 50740283121.

It is not a de Polignac number, because 12138204705 - 2¹ = 12138204703 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (12138204703) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 268671 + ... + 310580.

It is an arithmetic number, because the mean of its divisors is an integer number (667298304).

Almost surely, 2^12138204705 is an apocalyptic number.

12138204705 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12138204705 is a deficient number, since it is larger than the sum of its proper divisors (9215341023).

12138204705 is a wasteful number, since it uses less digits than its factorization.

12138204705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 579397.

The product of its (nonzero) digits is 13440, while the sum is 33.

Adding to 12138204705 its reverse (50740283121), we get a palindrome (62878487826).

The spelling of 12138204705 in words is "twelve billion, one hundred thirty-eight million, two hundred four thousand, seven hundred five".