12121638773 has 4 divisors (see below), whose sum is σ = 12122182380. Its totient is φ = 12121095168.

The previous prime is 12121638769. The next prime is 12121638787. The reversal of 12121638773 is 37783612121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 37783612121 = 71 ⋅532163551.

It can be written as a sum of positive squares in 2 ways, for example, as 1223740324 + 10897898449 = 34982^2 + 104393^2 .

It is a cyclic number.

It is not a de Polignac number, because 12121638773 - 2² = 12121638769 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 12121638773.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12121638713) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 236858 + ... + 283451.

It is an arithmetic number, because the mean of its divisors is an integer number (3030545595).

Almost surely, 2^12121638773 is an apocalyptic number.

It is an amenable number.

12121638773 is a deficient number, since it is larger than the sum of its proper divisors (543607).

12121638773 is an equidigital number, since it uses as much as digits as its factorization.

12121638773 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 543606.

The product of its digits is 84672, while the sum is 41.

The spelling of 12121638773 in words is "twelve billion, one hundred twenty-one million, six hundred thirty-eight thousand, seven hundred seventy-three".