12121861762 has 4 divisors (see below), whose sum is σ = 18182792646. Its totient is φ = 6060930880.

The previous prime is 12121861753. The next prime is 12121861777. The reversal of 12121861762 is 26716812121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 26716812121 = 23 ⋅1161600527.

It can be written as a sum of positive squares in only one way, i.e., 7181037081 + 4940824681 = 84741^2 + 70291^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3030465439 + ... + 3030465442.

Almost surely, 2^12121861762 is an apocalyptic number.

12121861762 is a deficient number, since it is larger than the sum of its proper divisors (6060930884).

12121861762 is an equidigital number, since it uses as much as digits as its factorization.

12121861762 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6060930883.

The product of its digits is 16128, while the sum is 37.

The spelling of 12121861762 in words is "twelve billion, one hundred twenty-one million, eight hundred sixty-one thousand, seven hundred sixty-two".