12642131226 has 16 divisors (see below), whose sum is σ = 26771572224. Its totient is φ = 3966158784.

The previous prime is 12642131207. The next prime is 12642131231. The reversal of 12642131226 is 62213124621.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12642131193 and 12642131202.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61971130 + ... + 61971333.

It is an arithmetic number, because the mean of its divisors is an integer number (1673223264).

Almost surely, 2^12642131226 is an apocalyptic number.

12642131226 is an abundant number, since it is smaller than the sum of its proper divisors (14129440998).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12642131226 is a wasteful number, since it uses less digits than its factorization.

12642131226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123942485.

The product of its digits is 6912, while the sum is 30.

Adding to 12642131226 its reverse (62213124621), we get a palindrome (74855255847).

The spelling of 12642131226 in words is "twelve billion, six hundred forty-two million, one hundred thirty-one thousand, two hundred twenty-six".