12138690722 has 4 divisors (see below), whose sum is σ = 18208036086. Its totient is φ = 6069345360.

The previous prime is 12138690679. The next prime is 12138690737. The reversal of 12138690722 is 22709683121.

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

It can be written as a sum of positive squares in only one way, i.e., 10974448081 + 1164242641 = 104759^2 + 34121^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 12138690722.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3034672679 + ... + 3034672682.

Almost surely, 2^12138690722 is an apocalyptic number.

12138690722 is a deficient number, since it is larger than the sum of its proper divisors (6069345364).

12138690722 is an equidigital number, since it uses as much as digits as its factorization.

12138690722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6069345363.

The product of its (nonzero) digits is 72576, while the sum is 41.

The spelling of 12138690722 in words is "twelve billion, one hundred thirty-eight million, six hundred ninety thousand, seven hundred twenty-two".