12261262126 has 4 divisors (see below), whose sum is σ = 18391893192. Its totient is φ = 6130631062.

The previous prime is 12261262063. The next prime is 12261262129. The reversal of 12261262126 is 62126216221.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12261262129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3065315530 + ... + 3065315533.

It is an arithmetic number, because the mean of its divisors is an integer number (4597973298).

Almost surely, 2^12261262126 is an apocalyptic number.

12261262126 is a deficient number, since it is larger than the sum of its proper divisors (6130631066).

12261262126 is an equidigital number, since it uses as much as digits as its factorization.

12261262126 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6130631065.

The product of its digits is 6912, while the sum is 31.

Adding to 12261262126 its reverse (62126216221), we get a palindrome (74387478347).

The spelling of 12261262126 in words is "twelve billion, two hundred sixty-one million, two hundred sixty-two thousand, one hundred twenty-six".