12155296121 has 4 divisors (see below), whose sum is σ = 12182368500. Its totient is φ = 12128223744.

The previous prime is 12155296081. The next prime is 12155296159. The reversal of 12155296121 is 12169255121.

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

It can be written as a sum of positive squares in 2 ways, for example, as 9540405625 + 2614890496 = 97675^2 + 51136^2 .

It is a cyclic number.

It is not a de Polignac number, because 12155296121 - 2¹⁴ = 12155279737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12155296421) 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, 13535516 + ... + 13536413.

It is an arithmetic number, because the mean of its divisors is an integer number (3045592125).

Almost surely, 2^12155296121 is an apocalyptic number.

It is an amenable number.

12155296121 is a deficient number, since it is larger than the sum of its proper divisors (27072379).

12155296121 is an equidigital number, since it uses as much as digits as its factorization.

12155296121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27072378.

The product of its digits is 10800, while the sum is 35.

The spelling of 12155296121 in words is "twelve billion, one hundred fifty-five million, two hundred ninety-six thousand, one hundred twenty-one".